fall in
definitions
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to enter a place or group, often by joining or becoming part of itzh: 加入;进入;参与
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to become quiet or calm, especially after a period of noise or activityzh: 安静下来;平息
examples
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The new recruits will fall in with the rest of the team.
新 recruits 将加入团队的其他成员。
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The crowd began to fall in after the concert ended.
音乐会结束后,人群开始安静下来。