HSK 7-9
起伏
qǐfú动
to move up and down; to undulate; ups and downs
远处山峰起伏如同波浪。
Yuǎnchù shānfēng qǐfú rútóng bōlàng.
The distant mountain peaks undulate like waves.
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Appears across levels (7-9) in the HSK 3.0 word list.