A trader who keeps a diary can learn from the past instead of mindlessly repeating mistakes.

做日记的交易者可以从过去学习，而不会重复犯错。

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If history tends to repeat itself, can we not at least learn from the past and avoid repeating mistakes?

如果历史往往重复发生，我们能否至少吸取以往的教训并避免重复犯错？

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Senator Bob Corker, the top Republican on the Senate's foreign relations committee, said the report's findings were "appalling" and that lessons must be learnt to avoid repeating mistakes in Afghanistan.

BBC: US's $60bn Iraq rebuilding effort 'achieved little'

They are in serious danger of repeating the mistakes of a number of their predecessors, i.e.

CENTERFORSECURITYPOLICY: Center for Security Policy | Time To Reinvigorate The US-Israeli Strategic Relationship

One argument against raising rates is that the Fed risks repeating the mistakes of Japan in the 1990s.

ECONOMIST: It is time for the Fed to start raising interest rates