英语词汇“billings method”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

单词	billings method
释义	Collins Concise English Dictionary © HarperCollins Publishers:: Billings method n a natural method of birth control that involves examining the colour and viscosity of the cervical mucus to discover when ovulation is occurring Etymology: 20th Century: devised by Drs John and Evelyn Billings in the 1960s
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