中文说明：原创：随机抽样。从一系列的总体中抽取出指定数量的不重复样本点。
English Description：
Original: random sampling. A specified number of unrepeated sample points are extracted from a series of populations.
A specified number of unrepeated sample points are extracted from a series of populations
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中文说明：原创：随机抽样。从一系列的总体中抽取出指定数量的不重复样本点。
English Description：
Original: random sampling. A specified number of unrepeated sample points are extracted from a series of populations.