U 开头单词
understandability n.易懂性；可理解性
understand trap 机警，聪明
understand tacitly 心领神会
understand his kind father 理解他好心的父亲
understand clearly 清楚地懂得 清楚地了解
understand vt. 理解；懂；获悉；推断；省略；明白 vi. 理解；懂得；熟悉
understain 浅染
understaffed adj.人员不足的
undersquare 下耳戳
underspend vt.vi；
underspeed n.速度不足(降低速度)
undersonic adj.次声的
undersong n.伴唱之歌；重叠句；隐匿之意义
undersole 大底,鞋底
undersold v. 低价出售(抛售； 售价比 ... 低)
undersoil n.下层土(底土)
undersocialization 社会化不足
underslung worm [能源科学技术]下置式蜗杆