When a baby is put face down in a bed, it begins to re-breathe carbon dioxide, which is toxic.

VOA: standard.2010.02.08

This is, remember, when he's hitched a ride in this truck, and it's a truck bed full of men who have hitched rides.

一个简短的例子，这个是他在搭顺风车,车里装满像他一样搭车的人的时候。

耶鲁公开课 - 1945年后的美国小说课程节选