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COMPOUNDS
cao hạ 
to go up and down, fluctuate
lên bổng xuống trầm to go up and down, be melodious
nhấp nhô heave, sway, go up and down (especially on the water)
cao hạ to go up and down, fluctuate lên bổng xuống trầm to go up and down, be melodious nhấp nhô heave, sway, go up and down (especially on the water)