形容词
中文翻译：光滑的
同义词：
['smooth', 'fluent', 'fluid', "smoothness例句：1. The car's engine is so smooth that it makes the ride comfortable.（这辆车的引擎非常平滑，使得乘坐体验舒适。）"]
例句：
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1. The car's engine is so smooth that it makes the ride comfortable.
这辆车的引擎非常平滑，使得乘坐体验舒适。
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2. Her speech was so smooth that she could have been a professional public speaker.
她的演讲非常流畅，她本可以成为一名职业的公共演讲者。
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3.The river flows smoothly through the valley.
这条河在山谷中平稳地流淌。