影响资源(特别是内存)的函数和方法需要显式地解释本身。

Functions and methods which impact resources, especially memory, need to explain themselves explicitly.

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递归函数有时对资源的消耗量很大，而且在用户失去耐心之前可能还没有返回结果。

Recursive functions can sometimes be very resource hungry and may not return results before a user loses patience.

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all函数返回模型中所有资源的集合。

The all function returns a set of all the resources in the model.

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