—一个选择和排序组件，可以在可用区与选定区之间移动项目，还可以在选定区中上下移动项目。

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.

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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.

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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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