在西班牙南部，温室的突然增加改变了当地的变暖趋势。

In Southern Spain, the sudden increase of greenhouses has changed the warming trend locally.

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“物种数量显著增加改变了生态系统的功能”，Sax说。

"The dramatic increase in the number of species has changed how the system functions," Sax said.

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“但是”，格里菲思说，“它们非常重要，因为演变进行的极为缓慢，在非常小的增加改变的基础上一代又一代”。

"But," says Griffith, "they are important, because evolution works incredibly slowly, on the basis of very small incremental changes from generation to generation".

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If you're not updating some variable by incrementing it or decrementing it -- if you're not changing anything, presumably the conditions are never going to evaluate to false or the opposite, so you're just going to have an infinite loop, which might be your goal, but odds are it's not.

如果你不通过增加或减少它来改变一些变量,-如果你不改变什么，大概那个条件永远不会变成错误的,或相反的，所以你将得到一个无限循环，那可能是你的目标，但可能也不是。

哈佛公开课 - 计算机科学课程节选