Sometimes it's a lot easier to reach into your wallet, pull out a piece of plastic and voila, there are the next several shuttle times.

都是不太方便的,也许伸进口袋，拔出一块塑料来看看，还有其他的班车时间呢。

哈佛公开课 - 计算机科学课程节选

I would guess that probably 30% to 50% of you do this everyday, you put a piece of plastic, a synthetic piece of plastic into your eye to improve your vision.

我猜你们有百分之三十到百分之五十的人,每天会做这样的事,将一小片塑料,合成塑料放到眼睛里,来提高自己的视力

耶鲁公开课 - 生物医学工程探索课程节选