quietens

v.

（使）安静( quieten的第三人称单数 )；（使）平静；（使）平息；（使）（感情）减轻

1. She tried to quieten herself down.
   她试图使自己镇静下来。
2. You must quieten down when the teacher comes into the classroom.
   老师来到教室时你们必须安静下来。

Noise quietens driving
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Australia Market Report on July 25: Banking Sector Recovery Quietens
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