"Most aphids are born pregnant and beget females without wastrel males," the US National Library of Medicine says. "Embryos complete development within the mother’s ovary one after another, in assembly line fashion. These developing embryos contain developing embryos of the third generation within them, like Russian dolls."

美国国家医学博物馆说：“大多数蚜虫一出生就是怀孕的，这些蚜虫产出的幼虫都是雌性。胚胎在卵巢内流水线一样一个个长成，这些长成的幼虫体内就带有下一代幼虫胚胎，就像俄罗斯套娃一样。”

Once a year, aphids have sex. The weather induces another "form" for the animal, which produces eggs rather than embryos. Males are also produced asexually.

蚜虫每年会进行一次交配。受季节影响，蚜虫会繁殖出另一种产卵类型的幼虫，还会无性繁殖出雄性幼虫。

4. A bear that fought with Poland in World War II was promoted to the rank of a corporal.

4.一只在二战期间与波兰士兵并肩战斗的熊拥有下士军衔。

Wojtek the Soldier Bear was released from the prison camps of Siberia only to be picked up in Iran by Allied forces. A Polish army looked after him, and he helped out with the war effort, moving ammunition during the Battle of Monte Cassino in Italy.

佛伊泰克熊士兵是从西伯利亚战俘集中营释放出来的，盟军在伊朗把它捡了回来。一支波兰部队照顾这只熊。这只熊在意大利蒙特卡西诺战役期间帮助部队运送弹药。

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