指发生重大事件的时代 epoch
这一时期发生了许多重大事件。
有证据表明，这一时期发生了重大的生态和地质变化。
There is evidence of major ecological and geological changes during this period.
就积极方面来讲，世行至少学会了在重大错误发生时学会去承认。
On the positive side, the bank has at least learnt to admit serious errors when they are proved to have happened.
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