Traditional: 專心
专心 (zhuān xīn) means “to focus one's attention; to concentrate on (doing sth)”. It is an HSK 5 Chinese word (traditional 專心) in the HSK 3.0 vocabulary.
上课要专心听讲,别分心。
Shàngkè yào zhuānxīn tīngjiǎng, bié fēnxīn.
Pay attention in class, don't get distracted.
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