1·Overall, this is a very useful book.
总的来说，这是一本很有用的书。
—— 《牛津词典》
2·My mobile phone is extremely useful.
我的手机极为有用。
—— 《柯林斯英汉双解大词典》
3·Photos make useful teaching aids.
照片可以成为有用的教具。
—— 《牛津词典》
4·In business a poker face can be very useful.
在生意场上，不露声色会非常有用的。
—— 《柯林斯英汉双解大词典》
5·I've made some useful contacts in journalism.
我在新闻界结交了一些有用的人。
—— 《牛津词典》
1·The document provided a springboard for a lot of useful discussion.
这份文件引发出许多有益的讨论。
—— 《牛津词典》
2·The newsletter is a useful channel of communication between teacher and students.
发简讯是沟通师生的有益渠道。
—— 《牛津词典》
3·His no-inflation bill serves as a useful counterweight to proposals less acceptable to the committee.
相对于那些不太为该委员会接受的议案来说，他的无通货膨胀法案可作为一个有益平衡。
—— 《柯林斯英汉双解大词典》
4·Fear is both useful and harmful.
恐惧既有益也有害。
5·Teenagers should experience more and stick to the useful activities.
青少年应该体验更多有益的活动并坚持下去。
1·It can be useful to write a short summary of your argument first.
先把你的论点纲要写下来可能会有帮助。
—— 《牛津词典》
2·It is especially useful for increasing flow of the lymphatic system.
它对增加淋巴系统的流量特别有帮助。
3·Pool Settings and thread pool configuration is really useful to control the scalability and not scale indefinitely until the container crashed: -.
池的设置和线程池的配置对伸缩性的控制非常有帮助除非容器崩溃，否则你不会为无法确定伸缩性而头痛：-。
4·For example, in debugging problems where you suspect the join order is not optimal, it can be useful to gather counts for different join combinations.
比方说，在调试怀疑连接顺序不是最优的问题时，针对不同的连接组合收集计数可能会有帮助。
5·When selecting computer hardware, it is very useful to remember a few principles.
在选择计算机硬件的时候，记住几条原则是很有帮助的。
1·It proves how useful moving water can be as a coolant, and shows why so many courtyards in hot countries have water fountains.
这证明流动的水作为冷却剂有多么管用，也显示了为什么许多炎热国家的庭院里设有喷泉。
2·Multivariate tests can be particularly useful if your client is unsure of how they want their site designed.
如果你的客户不确定网站设计要做出什么样，那多元测试就显得特别管用。
3·I began to think how ridiculous it is that our most useful allure is resistance and that our natural reaction is to push away someone who shows that he CARES.
我开始想这是有多滑稽。我们最管用的魅力是拒绝，我们最本能的反应是推开那些表现出关心我们的人。
4·The four Ps model is most useful when marketing low value consumer products.
营销低价值的消费者产品时，这个四个P的模型最管用。
5·This approach may be particularly useful for those who prefer not to take medications to help them sleep.
这个方法对那些不愿服药的人尤其管用。
1·This is useful, but the actual benefits of those credits to energy installations are not easy to figure, and beyond the scope of what I can write about here.
这是有效用的，不过那些抵免对于能源设备安装的实际意义还不容易搞清楚，这也超出了我在这儿论及的范围。
2·This means making more equipment useful and making the crew skill choices meaningful.
这这意味着使更多配件更有效用和使车组技能选择更有意义。
3·Dewey considers that truth is useful instrument, and it is always a hypothesis. If that is firmy established, people can eliminate dogma and method of authority decision.
杜威认为，真理是有效用的工具，它永远是一种假设，确立了这一观念，就可以在世界上消灭教条和权威的决断方法。