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。
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。
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。
Here the null or blank value does not represent incomplete data, but reflects that the business condition requiring the data has not yet occurred.
在这里，null或空白值并不表示不完整的数据，而是反映需要尚未出现的数据的业务情况。
This process continues until a condition passes or until no more news_source properties exist, in which case a null result is returned.
此过程将一直继续，直至条件通过或者直至不再有其他news_source属性，在这种情况下将返回一个null结果。
Note that the test for null values is gone from the for statement, because you want to handle that condition by writing a diagnostic record.
注意，对null值的检查从for语句中消失了，因为希望通过写诊断记录来处理这种情况。
For example, the default invariant condition for a field requires the field to be non-null.
例如，字段的默认不变条件要求字段不能为空。
Additionally, by using null flags in this way, the programmer effectively buries the evidence of where the exceptional condition occurred.
此外，这样使用空标志，程序员有效地掩盖了异常情况出现位置的迹象。
This paper is devoted to show the null exact controllability for a class of nonlocal parabolic equations with equiv-valued surface boundary condition.
本文讨论了具有等值面边界条件的抛物型方程的非局部的精确零能控性问题。
The condition that plasma breakdown on Tokmak is get enough high loop voltage and large null field region in the vacuum vessel area.
托卡马克装置产生等离子体击穿的条件是在真空室区域中达到足够大的环电压以及尽可能大的零场区。
Chapter two is about the 2D CA with rule 170 on null boundary condition (rule 170N in shot).
第二章是关于零边界条件下170规则（简称170N规则）元胞自动机的研究。
METHODS Analyze advantages and disadvantages of null stock in hospital drug storehouse, and the present condition of our hospital, sum up the specific method of carrying out null stock.
方法分析零库存管理的利弊，结合我院药库现状，总结实施相对零库存管理的比较可行的方法。
METHODS Analyze advantages and disadvantages of null stock in hospital drug storehouse, and the present condition of our hospital, sum up the specific method of carrying out null stock.
方法分析零库存管理的利弊，结合我院药库现状，总结实施相对零库存管理的比较可行的方法。
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