在他们的时代，科学知识还不能足以解决这些问题。
In their day scientific knowledge was insufficient to settle the matter.
有时印象派画家在外面作画，这在他们那个时代是非常不寻常的想法。
Sometimes Impressionists worked outside, which was a very unusual thought in their time.
也许他们被一个牧师在他们的青年时代。
许多伟大的作家，在他们那个时代并不是很受欢迎。
Many great writers were not appreciated fully while they were alive.
在他们登上历史舞台的时代，他们还很年轻。
They were young at the period of their entrance upon the stage of history.
在他们登上历史舞台的时代，他们还很年轻。
They were young at the period of their entrance upon the stage of history.
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