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 paddlewheel.

这是一个很简单的问题，通过观察重量是多少以及它下降了多远，来确定桨轮做了多少功。

youdao

When they get a tern or pelican to drop a fish, they plunge down and grab it off the surface of the water, which may have been how this bird got oiled.

当他们让一只燕鸥或鹈鹕扔下一条鱼时，他们会一头栽到水里，然后把鱼从水面抓起来，这可能就是这只鸟被油弄脏的原因。

youdao

It also includes instructions to create and drop collections, to specify how the query results are formatted, and to supply user credentials.

它也包含以下用途的指令：创建和删除集合、指定查询结果如何被格式化，以及提供用户凭证。

youdao

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。

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