To identify the beginning or end of a group or unit.
识别一组或一个单元的起始或结束位置。
A unit or group of complementary parts that contribute to a single effect, especially.
整体，全体：整体或相互补充的各部分的总体，该整体能促成单一效果，尤其是。
A unit or group of complementary parts that contribute to a single effect, especially.
整体，全体：整体或相互补充的各部分的总体，该整体能促成单一效果，尤其是。
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