每次考试到来的时候,约翰就变成了一只夜猫子,但这并非一个高效学习办法。
[误] John becomes a night cat every time the examination is coming. However, this is not a good way to learn.

[正] John becomes a night owl1 every time the examination is coming. However, this is not a good way to learn.

注:owl是猫头鹰的意思,即一种深夜不睡,睁一只眼,闭一只眼,筹备随时捕捉田鼠的动物。英语中用night owl来比喻常常熬夜的人,就像大家习惯用夜猫子一样。不论叫你夜猫子还是a night owl,开夜车(burn the midnight oil)一直免不了的。