单词	ultra acoustic
释义	ultra acoustic 声学
随便看	spectrum variable spectrum widening spectrum width spectrum window spectrumy spectry spects spectulate specul- specula speculable specular specular angle specular cast iron specular cast-iron specular coal specular color specular cross section specular density specular glass specular gloss specular hematite specular hematite (specularite) specular highlights specular image 不柔不刚，合道之长不栽桃李树，何日得成荫不栽桃李树，何日得成阴？不栽桃李种蔷薇不栽梧桐树，招不了凤凰来不欺暗室。不欺者，修德之本。不正而合，未有久而不离者也。不步人脚，独辟蹊径不死之药余容面陈余平余年余庆余弦余怒余悸余数余料余晖