It often occurs among commuters.

它经常发生在通勤者中。

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While this can happen, it is often a more gradual process that occurs over different experiences.

虽然这可能发生，但通常是一个更渐进的过程，发生在不同的经历中。

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When hay fever first occurs it is often mistaken for a summer cold.

花粉病刚发作时，常会被误认为是热伤风。

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In fact, it occurs less often than male breast cancer does.

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Although it often occurs upon waking, some women have trouble all day.

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It often occurs to me how little attention many businesses pay to the fact that most of us have a strong preference to be part of a group in which we feel comfortable, and react badly when that group is disturbed or broken.

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