形容词
中文翻译：光滑的
同义词：
['fluent', 'effortless', 'unobstructed例句：1. The car drove smoothly down the highway.（汽车沿着高速公路平稳地行驶。）']
例句：
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1. The car drove smoothly down the highway.
汽车沿着高速公路平稳地行驶。
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2.The river flows smoothly through the valley.
河流在山谷中顺畅地流淌。
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3. His speech was smooth and easy to understand.
他的演讲流畅且易于理解。