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

Yeah, I get homesick at least twice a quarter, I think.

想，我每个季度至少想家两次。

想吃中餐的时候 - SpeakingMax英语口语达人

If I thought there was 2/3 probability they'd choose Left and 1/3 probability they'd choose Right, then I think it's twice as likely they're going to choose Left, and I could redo this calculation.

如果你觉得对手选左的可能性是2/3,而选右的可能性是1/3,即对手选左的可能性是右的2倍时,我们再重新计算一下

耶鲁公开课 - 博弈论课程节选