HSK 7-9
滚动
gǔndòng动
to roll; (to do sth) in a loop; to scroll (computing); to progressively expand (economics)
圆木沿着山坡向下滚动。
Yuán mù yán zhe shān pō xiàng xià gǔn dòng.
The log rolled down the hillside.
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Appears across levels (7-9) in the HSK 3.0 word list.