The plastic can block air passages. The trash can also make the animal feel full, lessening its desire to eat or drink.

VOA: special.2009.09.22

You have a block here and then you have something above there floating in mid air.

你在这里放一个木块,让某物漂浮在木块之上

耶鲁公开课 - 心理学导论课程节选