undulate
- vi. 起伏，波动；震动；呈波浪形
- vt. 波动；使波动；使起伏；使成波浪形
- adj. 波动的；起伏的；波浪形的
英英释意
- 1. stir up (water) so as to form ripples
- 2. occur in soft rounded shapes;
- "The hills rolled past"
- 3. move in a wavy pattern or with a rising and falling motion;
- "The curtains undulated"
- "the waves rolled towards the beach"
- 4. increase and decrease in volume or pitch, as if in waves;
- "The singer's voice undulated"