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Authorities here depend on the public to keep an eye out for unusual packages or passengers.
VOA: standard.2010.04.01
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The "Vinca String Quartet" so keep an eye out for them.
长春花弦乐四重奏乐团,请关注他们
耶鲁公开课 - 聆听音乐课程节选
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Keep an eye out for this, particularly in pop music.
注意一下音乐的结构,特别是流行音乐
耶鲁公开课 - 聆听音乐课程节选