北美歌雀在切换到另一种类型之前，会一声一声地重复其中的一种，与之不同的是，北美歌雀会连续地创作更长的、更多变的歌曲，而不会重复。
Unlike the song sparrow, which repeats one of its several song types in bouts before switching to another, the warbler continuously composes much longer and more variable songs without repetition.
这个函数在不同的小部件类型需要在特定代码路径之间切换。
The function switches over the specific code paths that are needed for the different widget types.
任务切换和交接是相似类型的消耗。
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