However, when we teach history, we are just looking back at the past.

然而，当我们教授历史时，我们只是在回顾过去。

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Now I am afraid of looking back since the past life seemed like a horrible dream.

现在我害怕回顾过去，因为过去的生活就像一个可怕的梦。

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The notion is that people have failed to detect the massive changes which have happened in the ocean because they have been looking back only a relatively short time into the past.

这种观点认为，人们之所以没有察觉到海洋中发生的巨大变化，是因为他们用于回顾过去的时间相对较短。

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It goes back to the time of Buddha, who believed that the mind should always be fully in the present -- not looking back at the past or anticipating the future.

CNN: Mindfulness training busts stress

They were both looking back over the past few weeks and became very angry.

BBC: Millie Martin's mother 'angry and distraught'

Royal Mail plans to issue four stamps every month in 1999, looking back over the past 1, 000 years of British history and achievement.

BBC: News | UK | Queen's head goes up in smoke