nul

To fix the bug, disallow null as a valid topping ( really the fault of index. php, but you can idiot-proof the add() function) and remove duplicates in the toppings.

为了纠正这个bug，不允许null作为有效的配料（这实际上是index.php的错误，但是可以在add（）函数中增加保护措施）并删除重复的配料。

www.ibm.com

Failure. The NULL value has been passed as a parameter.

失败. 将空指针NULL传给了一个参数.

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Forecaster Dr Aidan Nulty said yesterday's storm was unusual for the time of year.

气象预报员AidanNulty博士说昨天的暴风雨在今年这个时候发生是不正常的.

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Dead mappings could be eliminated by periodically scanning the Map, calling get() on each weak reference, and removing the mapping if get() returns null.

可以通过周期性地扫描Map，对每一个弱引用调用get（），并在get（）返回null时删除那个映射而消除死映射。

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If mem block is NULL, pointer is ignored and free immediately returns.

如果NULL内存块,操作将被忽略并且函数立即返回.

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Because the WordNet documents don't contain any relative URIs, this parameter can be given as null.

因为WordNet文档不包含任何相对URI，所以此参数可以指定为null。

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Strings are initialized to null, not empty string.

String是被初始化为null, 不是空字符.

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This function returns the replaced node on success, or NULL on failure.

如果函数执行成功,将返回替换的节点;如果执行失败, 将返回null[空值].

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If the weak reference has been cleared ( either because the referent has already been garbage collected or because someone called WeakReference. clear()), get() returns null.

如果弱引用被清除了（不管是referent已经被垃圾收集了，还是有人调用了WeakReference.clear（）），get（）会返回null。

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