首先，它要求在需要缓冲区块的任何地方进行额外的管理工作(分配和释放内存块)。

First, it requires extra management work (allocation and freeing of memory block) wherever a buffer block is required.

youdao

每个内存块在分配时都包含一个bufferblockheader头，后面跟着一个用于存储实际数据的缓冲区块。

Each memory block, when allocated, consists of a BufferBlockHeader header followed by a buffer block for storage of actual data.

youdao

区块缓存器中会保存一个个单独的数据块。

The chunk cache stores the individual chunks.

youdao

If you have a set of blocks, mechanical, physical blocks,and I tell you to build something and I say, oh, by the way, you have to cut the blocks in smaller pieces, you are going to get angry, aren't you?

如果你要一个区块，力学的，物理区块，我告诉你要去建造东西,我说，顺便说一下，你必须将一整区块切成小块，你会生气，不会吗？

麻省理工公开课 - 固态化学导论课程节选