a smoothened [noun]
作定语时直接放在名词前，说明某物表面已经过处理而变得平滑。
She traced the smoothened edge of the old coin with her thumb.
她用拇指抚摸着那枚旧硬币被磨得光滑的边缘。
已平滑的；变得光滑的
被弄平滑的
made smooth; having been smoothened
被弄平滑的
Having been made smooth.
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。
用法提示：smoothened 作定语形容词，表示‘被弄平滑的’。
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。
用法提示：smoothened 修饰名词，描述被磨平的状态。
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。
用法提示：smoothened 作形容词，强调道路经过处理后变得平坦。
作定语时直接放在名词前，说明某物表面已经过处理而变得平滑。
She traced the smoothened edge of the old coin with her thumb.
她用拇指抚摸着那枚旧硬币被磨得光滑的边缘。
用于说明变得光滑的原因，by 后面接造成这一结果的事物。
The granite steps were smoothened by decades of footsteps.
花岗岩台阶被几十年的踩踏磨得光滑了。
常与 freshly、newly、perfectly 等副词连用，强调处理刚刚完成或程度很高。
The freshly smoothened concrete gleamed in the morning sun.
刚被抹平的混凝土在晨光中泛着光。
grammar · medium
易错句子The cream has a smoothened effect on the skin.
正确表达The cream has a smoothening effect on the skin.
-ed 形容词描述“被……的”感受者，-ing 形容词描述“令人……的”事物。面霜是使皮肤变光滑的原因，所以要用 smoothening，不能用 smoothened。
grammar · medium
易错句子The baby's skin looks smoothened.
正确表达The baby's skin looks smooth.
smoothened 是结果形容词，表示“被弄平滑的”，强调经过外力处理；描述天生的、固有的光滑状态要用 smooth。
smoothed 是 smooth 的常规过去分词，作定语或表语都常见；smoothened 来自罕用动词 smoothen，多见于技术或旧式文本，日常英语几乎一律用 smoothed。
smooth 直接描述表面本身光滑，不暗示经过处理，常作定语或表语；smoothened 强调“被弄平滑”这一动作结果，多作定语。
smoothen 是动词，在句中作谓语，如 smoothen a surface；smoothened 是它的过去分词或形容词，不能直接充当谓语。
smooth（词根）
smooth + -en
smooth + -ly
smooth + -ness
smooth + -ing
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