短语讲解：

1. Our opposable thumbs, as we call them, allow us to work with our fingers.

work with 与…在一起干; 从事…工作
例句：For the sake of convenience we shall work with the space.
为了方便起见，我们将利用空间。

2. This expression can also be used for things that you don’t respect, for example a type of literature or art or music, or even a law.

be used for 用来做…
例句：The dialysis principle can be used for demineralization of brackish water.
渗析原理的应用是除半咸水中的盐。

3. But thumbing a ride, as hitchhiking is also called, is no longer considered a safe way to travel.

no longer 不再，已不
例句：He could no longer hold back his tears.
他再也忍不住自己的眼泪。

4. In fact, it is even illegal in some U.S. states.

in fact 事实上; 实际上
例句：In fact, that is the reason why I'm here to see you.
事实上 这是我来见你的原因。

5. If a number of people are deciding on a yes or no question, someone can call for a thumbs up or thumbs down vote.

a number of 一些; 许多的
例句：They found a number of simple expediencies to dissolve the contract.
他们找出了许多解除合同的简便方法。
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