变位
形容词,比较级 (Adjective, comparative): smoother
形容词,最高级 (Adjective, superlative): smoothest
形容词 (Adjective): smooth
动词,过去时 (Verb, past tense): smoothed
动词,过去分词 (Verb, past participle): smoothed
动词,动名词或现在分词 (Verb, gerund or present participle): smoothing
动词,第三人称单数现在时 (Verb, 3rd person singular present): smooths, smoothes
动词,原形 (Verb, base form): smooth
动词,非第三人称单数现在时 (Verb, non-3rd person singular present): smooth