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為圓形，也稱為子宮環、節育環、避孕環。現今一般为T形，由醫生在月经期间放入子宮，在有效期限内可提供避孕效果。宮內節育器屬於長效可逆避孕裝置（英语：long-acting reversible birth control）。在眾多避孕方式中，使用者對於宮內節育器和避孕植入管（英语：Contraceptive
tuning?. IBM. [2024-12-09]. Ouyang, Long; Wu, Jeff; Jiang, Xu; Almeida, Diogo; Wainwright, Carroll L.; Mishkin, Pamela; Zhang, Chong; Agarwal, Sandhini;
株落失能
1016/s0952-7915(98)80082-4. Saibil, Samuel D.; Deenick, Elissa K.; Ohashi, Pamela S. The sound of silence: modulating anergy in T lymphocytes. Current Opinion
Jian, Shuguang; Soltis, Pamela S.; Gitzendanner, Matthew A.; Moore, Michael J.; Li, Ruiqi; Hendry, Tory A.; Qiu, Yin-Long; Dhingra, Amit; Bell, Charles
classified info with Russians. CNN. [2017-05-16]. （原始内容存档于2017-05-15）. CNN, Pamela Brown, Jake Tapper and Stephen Collinson. Memo: Trump asked Comey to end