When users need a block of memory, they make a request for a given size.
当用户需要一块内存时，就请求给自己分配一定大小的内存。
Fills a block of memory with zeros.
将指定内存区域清零。
Allocates a block of memory from a heap.
从指定堆上面分配内存块。
Fills a block of memory with a specified value.
填充内存，将一段内存填充为同一个值。
A free block is a block of memory that has been released.
“可用块”是已释放的内存块。
So you have to allocate a block of memory large enough to hold the data.
所以你必须分配一个足够大的内存块来容纳数据。
So you have to allocate a block of memory large enough to hold the data.
所以你必须分配一个足够大的内存块来容纳数据。
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