1·A previously unknown extremist group has said it carried out Friday's bomb attack.
一个先前未知的极端分子组织声称其实施了周五的炸弹袭击。
—— 《柯林斯英汉双解大词典》
2·It's dark and unknown.
它黑暗而未知。
3·His whereabouts have been utterly unknown so far.
迄今他的下落全然未知。
—— 《新英汉大辞典》
4·I remember the fear and the panic of the unknown.
我记得那种对未知的恐慌感。
5·It urges us to explore the unknown domain of the universe.
它促使我们去探索宇宙的未知领域。
1·While there are signs that a mushroom is poisonous, they are not consistent, and all mushrooms of unknown origin should be considered dangerous to eat.
尽管有特征说明蘑菇是有毒的，但它们是不一致的，所有来历不明的蘑菇都应该被认为是有危险的食物。
2·Unknown attackers riddled two homes with gunfire.
不明来路的袭击者用枪把两座房屋打得千疮百孔。
—— 《柯林斯英汉双解大词典》
3·He admitted that his calculation could be wrong if there were unknown sources of heat, but didn't give that possibility much thought.
他承认如果有来源不明的热量的话，他的计算有可能是错的，但并没有过多考虑这种可能性。
4·A dragon like rock formation created from thousand years of erosion. When I returned there last April, the dragon's head has collapsed for unknown reason.
几千年的腐蚀创造而成了一条像龙的岩石形成。去年四月，当我回到那儿，这条龙的头部由于不明原因而倒塌了。
5·Within the medical profession, some have raised concerns about the unknown effects of the additives in the vaccines, in particular a substance called squalene.
在医学界，有些人已经对疫苗中的添加物，尤其是一种名为角鲨烯的物质的不明影响表示了担忧。
1·The contract was awarded to a previously unknown company.
该合同给了一家先前不知名的公司。
—— 《柯林斯英汉双解大词典》
2·If an unknown person enters a home, the camera will send the owner a warning that will cause an alarm to sound on the owner's smartphone.
如果一个不知名的人进入家中，摄像头就会向主人发送警告，并在主人的智能手机上响起警报。
3·Since 2006, in France, an unknown gang of thieves have been emptying supermarket safes, using nothing more than a drill and a modified vacuum cleaner.
自2006年起，法国有一个不知名的盗窃团伙专门开超市保险箱，所用的工具只有电钻和改造的真空吸尘器。
4·Being rich wouldn't be bad either, but that won't happen unless an unknown relative dies suddenly in some distant land, leaving me millions of dollars.
有钱不是什么坏事，但这种情况不会发生在我身上，除非一个不知名的亲戚突然在某个遥远的国度去世了，给我留下了数百万美元的遗产。
5·So we started to get requests from European companies from individuals, from small companies, because who was going to work with an unknown Russian software security company, in 94?
谁会在94年和一个不知名的俄罗斯软件安全公司做生意？ 所以我们一开始就从欧洲的公司、从个人、从小型公司接订单。
1·It is still unknown how the universe came into existence.
人们仍然不知道宇宙是如何形成的。
2·There have been no studies of the effects of a low carbohydrate diet on pregnancy, so its effect on the fetus, if any, is unknown.
目前还没有关于怀孕时低碳水化合物饮食影响的研究，因此如果它对胎儿有什么影响也是不知道的。
3·It was also, and this is unknown even to many people well read about the period, a battle between those who made codes and those who broke them.
甚至许多熟读这段时期历史的人都不知道，这也是一场编写代码者和破译代码者之间的战争。
4·By default, the system assigns each application a unique Linux user ID (the ID is used only by the system and is unknown to the application).
默认情况下，系统将为每个应用分配一个独一无二的Linux用户ID(这个ID仅被系统使用，应用本身是不知道它的)。
5·There have been no studies of the effects of a low carbohydrate diet on pregnancy, so its effect on the fetus, if any, are unknown.
目前为止还没有关于怀孕时低碳水化合物饮食影响的研究，因此如果对胎儿有什么影响也是不知道的。
1·The young man sat safe within, till at length it ran ashore upon an unknown land.
年轻人安全地坐在里面，直到最后它漂到一块陌生的陆地上。
2·But in her new home, in a distant unknown country, it would not be like that.
但是在她的新家里，在一个遥远陌生的国家里，事情就不会是那样了。
3·If I choose action, don't think that contemplation is like an unknown country to me.
如果我选择了行动，你们不要以为，思考对于我来说就成了一个陌生的国度。
4·As for the slaves, escape meant a journey of hundreds of miles through unknown country, where they were usually easy to recognize.
至于那些黑奴，逃亡意味着数百英里的长途跋涉，意味着穿越自己极易被人辨认的陌生地域。
5·But there was a more real life for Hester Prynne, here, in New England, that in that unknown region where Pearl had found a home.
但对海丝特·白兰来说，住在新英格兰这里，比起珠儿建立了家园的陌生的异乡，生活更加真实。
1·The scientist confirmed the snake was a previously unknown species after conducting a genetic analysis of tissue samples.
在对组织样本进行基因分析后，科学家确认这条蛇是一个此前不为人知的物种。
2·The team was led by Dr. Graham Reynolds, from Harvard University, the scientist confirmed the snake was a previously unknown species after conducting a genetic analysis of tissue samples.
该研究小组由哈佛大学的格雷厄姆·雷诺兹博士带队，这位科学家在对组织样本进行基因分析后，确认这条蛇是一个此前不为人知的种类。
3·The team was led by Dr. Graham Reynolds, from Harvard University, the scientist confirmed the snake was a previously unknown species after conducting a genetic analysis of tissue samples.
该研究小组由哈佛大学的格雷厄姆·雷诺兹博士带队，这位科学家在对组织样本进行基因分析后，确认这条蛇是一个此前不为人知的物种。
4·Dive like a secret agent, colourful shoals of fish swim past, corals shimmer in the distance, while you enjoy the endless tranquility and discover the whimsical beauty of an unknown underwater world.
像特工一般潜水，五颜六色的鱼群从身边游过，珊瑚在远处微微发光，你享受着无穷无尽的静谧，探索着不为人知的水下世界神秘梦幻的美。
5·Building trust for an unknown Indian brand is the biggest difficulty he faces.
为一个不为人知的印度品牌建立信任感是他面临的最大困难。
1·Retailers are taking no chances on unknown brands.
零售商们不在无名品牌上冒险。
—— 《柯林斯英汉双解大词典》
2·There towers aloft in the square the Monument of Unknown Heroes.
广场上矗立着无名英雄纪念碑。
—— 《新英汉大辞典》
3·What but the melody of song can tell us of the goings and comings of the unknown bird?
除了歌的曲调，谁还能告诉我们这只无名的鸟的来来去去呢？
4·As one example, consider a person who grew up poor and poorly educated, but became wealthy through the luck of the lottery or an inheritance from an unknown but wealthy relative.
例如，我们不妨考虑一下这样一个人，他出身贫穷，没能受过良好的教育，但通过彩票的运气或由于继承了一位无名但却有钱的亲戚的遗产而一夜暴富。
5·But which of the 645 crew members was the Unknown Sailor?
可是，这位无名水兵是645名船员中的哪一位呢？
1·The Frenchman was an unknown quantity when he arrived in north London back in 1996.
1996年，当他初到北伦敦时，这个法国人还只不过是个未知数而已。
2·The findings of the 2011 Nobel Laureates in Physics have helped to unveil a universe that to a large extent is unknown to science.
2011年诺贝尔物理学桂冠的发现有助于揭开宇宙的秘密，宇宙在科学范围内很大程度都是未知数。
3·What is still unknown, he says, is how full production will affect the deposits, and what mixture of gases and water must be injected to maintain their output.
他表示全面投产究竟对矿物沉积层会造成怎样的影响和必须注入什么样的水和天然气混合物才能维持生产还都是未知数。
4·The second was classification (also known as classification tree or decision tree), which can be used to create an actual branching tree to predict the output value of an unknown data point.
第二种技术是分类（即分类树或决策树），用来创建一个实际的分支树来预测某个未知数据点的输出值。
5·For the majority of these managers, MDD is a big unknown, with a lot of potential risk and uncertain benefits.
对于大多数管理人员来说，MDD是一个巨大的未知数，并且有许多潜在的风险和不确定的利益。
1·Bass may have perished there after years of wearisome and unknown labour.
男低音也许是在多年的劳累和默默无闻的劳动之后，才在那里绝迹的。
2·And how does a book by a relatively unknown journalist end up as an international bestseller?
一位相对默默无闻的记者如何写出了一本在全世界热卖的畅销书？
3·Cheng Guorong lived unknown on the streets of Ningbo about half a month ago.
在半个月之前，程国荣还默默无闻地生活在宁波街头。
4·An unknown boy was cast in the leading role.
一个默默无闻的男孩子被挑选扮演主角。
5·Sometimes, it is better to remain unknown than to make pimple hate you.
有时，保持默默无闻比让人恨你要好得多。