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。
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.
对于每一个具体的困难，我们都要采取认真对待的态度，创造必要的条件，讲究对付的方法，一个一个地、一批一批地将它们克服下去。
We must adopt a serious attitude towards each specific difficulty, create the necessary conditions, study the methods for coping with them and overcome them one by one and batch by batch.
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