堆桶是另外一种内存内桶。
如果有过需要显式创建一个堆桶，我们很少这样做：更多的是他们被内部管理，当我们使用成套的API来写数据给下一个过滤器时。
We rarely if ever need to create a heap bucket explicitly: rather they are managed internally when we use the stdio-like API to write data to the next filter.
然后他说他们在垃圾桶里发现了一堆文件。
Then he said they had found a pile of papers in their trash can.
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