They're considered amphibians, and amphibians are reproductively tied to the water.

它们被认为是两栖动物，而两栖动物与水有生殖联系。

So unless we honest-to-goodness get rid of every reproductively active individual, eventually, they'll return as vigorously as before, keeping us constantly on our toes.

因此，除非我们真正除掉所有能活跃繁殖的个体，否则最后他们将恢复从前的活力，让我们不得不随时注意自己的脚趾。

A Dutchman named Comeille de Pauw announced in a popular work called Recherches Philosophiques sur les Americains that native American males were not only reproductively unimposing, but so lacking in virility that they had milk in their breasts.

有个名叫科梅耶·波夫的荷兰人在一本名叫《关于美洲人的哲学研究》的通俗作品中宣称，美洲的土著男人不但在繁殖方面给人印象不深，而且“如此缺乏生殖能力，他们的乳房都流着奶汁”。