If the size of the reallocated block is smaller than the original block, the block is split and the extra block is returned to the free tree with the required size block being returned to the caller.
如果重新分配的块小于原来的块，那么把它分割开，多余的块返回给空闲树，请求的块返回给调用者。
2
Similar entries will group together in the index, so the index blocks will split as necessary and new entries will end up all hitting the same block until it too fills up and splits.
相似的项将在索引中同一组中，所以索引块将按需分割，且新的项将填入同一个块，直至该块已满并分割。
3
From the urban point of view, the block is broken into several slices which have been split in order to multiply the free corners.