花四年时间主修英国文学，到头来却发现自己并不比入学前更具有就业能力，这是很常见的。

It's very easy to spend four years majoring in English literature and come out no more employable than you were before you went in.

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我们每年花四个月的时间上网，当我们不上网的时候，常常会为想要上网的欲望而感到压力很大。

When we're not online, where we spend four months annually, we're engaged in the stressful work of trying to get online.

youdao

特别体育运动参与率从1981年到1997年上升了近50%：男孩们现在平均每周花四个小时做运动；而女生则只花一半的时间。

Involvement in sports, in particular, rose almost 50% from 1981 to 1997: boys now spend an average of four hours a week playing sports; girls log half that time.

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And in fact, one of the lessons you may already be realizing with P sets is that things seem to take twice, three times, four times longer than you actually might think.

从习题集中你可能已经得出的一个教训就是,程序所花的实际时间往往是你开始以为的两倍，三倍，四倍甚至更长。

哈佛公开课 - 计算机科学课程节选

It varies with the square of distance so it goes - in order to go twice as far it takes four times as long.

速度是与距离的平方正相关的--,如果要扩散两倍的距离要多花四倍的时间

耶鲁公开课 - 生物医学工程探索课程节选