Intrauterine devices ( IUDs ) are safe and effective forms of long - term reversible contraception.
宫内节育器 ( IUDs ) 是安全有效且可逆的 长期 避孕方法.
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There are two available IUDs : one containing a progestin ( a hormone ) and the other containing copper.
有两种宫内 节育器,一种含有黄体酮,另一种含有铜.
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