HSK 7-9
来回
láihuí动名副
to make a round trip; return journey; back and forth; to and fro
他在走廊里来回踱步。
Tā zài zǒuláng lǐ láihuí duóbù.
He paced back and forth in the corridor.
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Appears across levels (7-9) in the HSK 3.0 word list.