...The reason is unknown, but it is said that opposite-sex twins are frowned upon and eliminated, or that Japanese women have low levels of gonadotropins, which cause ovulation. *Some of the terminology that refers to "perineal protection" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…その原因は不明であるが,男女の異性双胎が嫌悪され淘汰されたとか,排卵をおこすゴナドトロピンが日本女性では少ないためともいわれる。 ※「会陰保護」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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