3. Moonlighting is working a nighttime job in addition to a day job.

　　in addition to 除之外

　　例句：In addition to French, he has to study Japanese.

　　除了法语外,他还得学日语。

　　4. And this study says that is what our brains seem to be doing working an extra job at night without additional pay for overtime.

　　pay for 赔偿; 为付钱

　　例句：I ll give you double pay for working overtime.

　　你加班我付你双倍工钱。

　　5. Whereas when we are asleep, they work very, very hard at removing all the waste that builds up when we are awake.

　　build up 逐步建立

　　例句：The cash pile will quickly build up again.

　　资金量会很快再次增大。

　　6. There, they are broken down and then removed from the body.

　　break down 失败; 划分

　　例句：Cellulose is hard to break down.

　　纤维素是很难分解的。

　　7. The test animal must be alive in order to see for this brain process to be seen as it happens.

　　in order to 为了

　　例句：They buy patents in order to sue infringers.

　　他们购买专利的目的就是为了起诉专利侵权者。

　　8. Dr. Nedergaard says the next step is to look for the process in human brains.

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