subservient的英语例句
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Each subset is determined by some occurrence of these three events.
每一个子集,由这三种事件出现的情况而决定.
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A subset S of a ring A is a subring of A.
环A的子集S叫作A的子环.
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This would enable the production of subset catalogues by subject.
这将使按主题编制子集合目录成为可能.
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