避孕
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用(yòng )器(qì )械(xiè )或(huò )药(yào )物(wù )阻(zǔ )止(zhǐ )精(jīng )子(zǐ )和(hé )卵(luǎn )子(zǐ )相(xiàng )结(jié )合(hé ),使(shǐ )不(bú )受(shòu )孕(yùn )。
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