在libcurl开始之前，libjpeg就已经完成对缓冲区的处理。fflush看起来有些多余，但是可以确保剩余的数据仍在内存中。

Libjpeg finishes touching the buffer before libcurl starts, and that fflush that might otherwise have seemed redundant ensures that any remaining data are in memory.

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如果另一个虚拟处理器需要这个锁，并且拥有多余的周期，那么它通过这个调用将剩余周期交换给第一个处理器。

If another virtual processor needs that lock and has excess cycles, it confers those to the first processor through this call.

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当你摄取盐比你的身体需要的大量的盐，剩余持有着多余的水。

When you take in more salt than what your body needs, the surplus amount of salt holds on to excess water.

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