World trade is expected to drop eleven percent this year, after expanding by three percent last year.

VOA: special.2009.04.24

So, it's a trivial matter, by looking at what is the weight and how far does it drop, to say OK, how much work is done by the paddle wheel.

好，让我们看看重物的质量,以及它下落的距离，就知道桨轮做了多少功。

麻省理工公开课 - 热力学与动力学课程节选

Half of the groups expect giving to drop this year by more than nine percent.

VOA: special.2009.11.02

By 2012,they hope to set up a network of pick-up and drop-off locations for rented bicycles throughout New York City.

VOA: standard.2010.01.31