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The regular sequence or concatenation of social phenomena must be studied to find out what can be done, and what should be done.
为了找出能够做点什么、应该做点什么，必须对社会现象的常规序列或连锁反应进行研究。
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Concatenation refers to the operation of appending one sequence to another.
串联是指将一个序列追加到另一个序列的运算。
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