名词
中文翻译：起伏的
同义词：
['undulate', 'undulate', 'wave', 'roll', 'rise and fall', 'oscillate']
例句：
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1. The waves undulated gently as the tide receded.
潮水退去时，波浪轻轻起伏。
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2.The undulating terrain of the desert was a stark contrast to the flat plains.
沙漠起伏的地形与平坦的平原形成了鲜明的对比。
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3. The undulating hills were dotted with small villages.
起伏的山丘上点缀着一些小村庄。