v.波动，起伏，呈波浪形( undulate的第三人称单数 )，使波动，使起伏，使成波浪形...

The countryside undulates pleasantly.原野起伏，景色宜人。The road undulates through pleasant scenery.那条道路在宜人的景色中延绵起伏.The price of steel and iron products and materials undulates fiercely on the current market.当今的市场,钢铁产品和原材料的价格上下波动...

undulates的音标：...