This attribute is a hint to the compiler that the function declared with this attribute and the subsequent functions it calls do not throw an exception.

这个属性可以告诉编译器，使用该属性声明的函数以及它调用的后续函数都不会引发异常。

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4 (Exercise) Fordemand x(p) = p–e, for e > 1, find the consumersurplus as a function of p. (Hint: recall that the consumer surplus can be expressed as .)

(练习) 对于需求 x(p) = p–e 其中 e > 1 用p表示出消费者剩余. (提示: 回忆一下，消费者剩余函数可以表示为.)

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Perhaps one useful hint about the original function of sleep is to be found in the fact that dolphins and whales and aquatic mammals in general seem to sleep very little.

海豚、鲸鱼以及水生哺乳动物睡眠都极少，这一事实可以给睡眠的根本功能提供有用的线索。

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