When captive they are incredibly difficult to breed - but staff at Basel Zoo, Switzerland, have managed to imitate their natural conditions and a new batch of tiny jellyfish have been born.
人工饲养时他们几乎不可能繁殖——但是瑞士巴塞尔动物园的工作人员成功地再造了它们的自然条件，一批新的小型水母诞生了。
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