HSK 7-9
穿梭
chuānsuō动
to shuttle back and forth
快递员每天穿梭于各小区。
Kuài dì yuán měi tiān chuān suō yú gè xiǎo qū.
The courier shuttles among residential complexes every day.
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Appears across levels (7-9) in the HSK 3.0 word list.