单词 | Billings method |
释义 | Billings methodnoun A system for finding the time of ovulation by examining cervical mucus. It can be used as a form of birth control by avoiding sexual intercourse at that time.She said she introduced the Billings method to all couples who came to her for a pregnancy examination....
Origin1960s: named after Drs John and Evelyn Billings, who devised the method. |
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