Because SBRK may give back more memory than we ask for, we leak some memory at the end of the heap.
由于sbrk可能会交回比我们请求的更多的内存，所以在堆(heap)的末端会遗漏一些内存。
2
This script leak is entirely within a page and when you navigate away then you get your memory back.
这种内存溢出完全是页内的，只要发生了跳转，溢出的内存就被收回。
3
Moreover, allowing the liquidity that has been built up on the central bank's balance sheet to leakback into the commercial financial system would provide ample low-cost capital.