名词
中文翻译：Unknown
同义词：
['smoothness', 'smoothness', 'smooth surface例句：1. The car was very smooth when it started.（这辆车启动时非常平稳。）']
例句：
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1. The car was very smooth when it started.
这辆车启动时非常平稳。
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2.The road is very smooth, which makes driving easier.
这条路非常平滑，这使得驾驶更容易。
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3.The paint on the wall is very smooth, giving it a glossy look.
墙上的油漆非常平滑，给人一种光泽感。