Grammar Note
常用于定语或表语，表示已变得平滑或光洁
已平滑的；变得光滑的
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已平滑的；变得光滑的
made smooth; having been smoothened
After sanding, the smoothened surface reflected the light evenly.
打磨之后，平滑的表面均匀地反射光线。
被弄平滑的
Having been made smooth.
She ran her fingers over the smoothened edge of the wooden table.
她用手指抚过木桌光滑的边缘。
The smoothened road made the bicycle ride much more comfortable.
平整后的道路使骑自行车舒服多了。
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常用于定语或表语，表示已变得平滑或光洁
Dictionary facts from ECDICT, WIKTIONARY, WORDNET.