1·The population increased in number threefold.
种群的数量增加了三倍。
2·Over the whole planet, there will be a threefold increase in the average acidity of the oceans, which is unprecedented during the past 20 million years.
在整个地球，海洋平均酸度将增加三倍，这是在过去两千万年里从未发生过的。
3·The number of different engine sounds has increased threefold. Gasoline and diesel engines now have different sounds.
不同的发动机音效的数增加了三倍。汽油和柴油的发动机现在拥有不同的音效。
4·The global demand for water has increased threefold over the past 50 years.
回顾过去的50 年，全球的水需求量已增加了三倍。
5·In a report to Congress, the analysts say combat incidents have increased threefold since 2007.
在向国会递交的报告中，分析人员表示，自2007年以来，战斗次数增加了三倍。
1·Mr Koizumi's achievement is threefold.
小泉有三重成就。
2·Van Til's threefold perspectival scheme appears in a series of chapters devoted to the topic of general revelation.
范泰尔的三重视角架构，出现在他讨论普遍启示的一系列篇章里。
3·And fivefold, threefold and twofold axes of rotational symmetry.
五重，三重和两重螺旋对称轴。
4·Thus the second-lowest energy level of the particle in a cube is threefold degenerate.
于是立方体中的第二最低能级是三重简并的。
5·Two combinable nucleus sentences can be joined to make a expansible sentence. Such expansion in natural language has its own Characteristics: twofold, threefold or even multifold.
具有可连接性的两个核心句能组合生成一个扩展句；扩展在自然语言中表现为双重、三重甚至更多重的扩展，具有自己的组合类型。