他一直专心于研究文明史。

He has been diving into the history of civilization.

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研究与教学之外的业余时间，她专心于自然摄影，拍摄了大量风景照片。

When she is off duty from her research and teaching, she concentrates on nature photography, shooting at the macro and landscape levels.

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结果研究人员发现，当参与者专心于更困难的视觉性任务时，其注意到这些声音的概率大大降低，哪怕这些声音是单独播放的，也不例外。

The researchers found that they were far less likely to hear the tone while performing the more difficult visual task, even when it was played on its own.

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