It often occurs among commuters.

它经常发生在通勤者中。

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Good writing most often occurs when you are in hot pursuit of an idea rather than in a nervous search for errors.

优秀的文章通常诞生在你热切寻找一个灵感的时候，而不是在你紧张地寻找错误的时候。

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Below are some areas in which confusion often occurs.

以下是一些经常出现混淆的领域。

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Eczema is an itchy skin condition, which often occurs on the arms or behind the knees.

NPR: Study: Food, Skin Allergies Increasing In Children

Stroke, the third leading cause of death in the United States, often occurs without warning.

CNN: Vitamin E may reduce risk of stroke

Indeed, sampling often occurs in areas so remote that we have to camp underground for days at a time.

BBC: Cave bacteria could help develop future antibiotics