Determine who is allocating the memory.
断定是谁在分派内存。
When allocating memory from the heap, the contents of that memory are garbage — whatever bits happen to be left over from the last time that memory was used.
在从堆中分配内存时，不管上次使用内存之后留下了什么内容，内存中的内容都被当作垃圾。
Allocating blocks of zero-filled memory the library may need.
分配程序库可能需要的由零填充的内存块。
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