Buffer size changes, allows quality adjustments for vocal or percussion.

缓冲区大小的变化，使质量的调整，声乐或敲击。

youdao

That's a problem because, while a buffer's size doesn't change once it's allocated, the amount of space left in the buffer changes every time data is added or removed.

这之所以会成为问题是因为，虽然缓冲区的大小一经分配就不会变化，但是缓冲区中剩余的空间量会在每次添加或删除数据时发生变化。

youdao