This mechanism has the benefit of limiting repeated conditionals testing for certain constraints, such as collection sizes or the previously discussed not-null condition.

这种机制具有限制针对特定约束条件的重复条件测试的好处，如集合大小或之前讨论过的非null的情况。

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If the condition evaluates to FALSE or NULL, the loop is bypassed, and control passes to the next statement.

如果条件的求值结果为FALSE或NULL，那么将绕过循环，并且控制被传递给下一条语句。

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Since a NULL pointer terminates a list, we can also use the NULL pointer condition as a base case for many of our recursive functions on linked lists.

由于 NULL 指针会结束一个链表，所以我们也可以使用 NULL 指针条件作为基于链表的很多递归程序的基线条件。

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