U 開頭單詞
understandability n.易懂性；可理解性
understand trap 機(jī)警，聰明
understand tacitly 心領(lǐng)神會(huì)
understand his kind father 理解他好心的父親
understand clearly 清楚地懂得 清楚地了解
understand vt. 理解；懂；獲悉；推斷；省略；明白 vi. 理解；懂得；熟悉
understain 淺染
understaffed adj.人員不足的
undersquare 下耳戳
underspend vt.vi；
underspeed n.速度不足(降低速度)
undersonic adj.次聲的
undersong n.伴唱之歌；重疊句；隱匿之意義
undersole 大底,鞋底
undersold v. 低價(jià)出售(拋售； 售價(jià)比 ... 低)
undersoil n.下層土(底土)
undersocialization 社會(huì)化不足
underslung worm [能源科學(xué)技術(shù)]下置式蝸桿