A selection and ordering component that can move items between available and selected areas, and up and down in the selected area. Figure 2 shows an example.
2
目前，它将返回所有可用的缓冲区，但是我们只需要一个。
Now, it will return all available buffers, but you only want one.
3
当然，这只会检索到第一个可用的缓冲区，可能有更多的可用缓冲区。
Of course, this only retrieves the first buffer available — there may be more.
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