unnel隧道
UNabbr.(=United Nations) 联合国pron.<口>人,事物,家伙,东西
uncontrolled settlement违章住区
undisclosed association[经] 不公开的联合; 未公开的组织
uncoordinated extension不协调伸展
uncontrolled combustion无控制燃烧
unprofitable aggression无益攻击
Unconsolidated sihstone第四系
uncoursed random rubble不分层乱石圬工
uncompensated liability违约债务
unconfined seepage flow无压渗流
undisturbed frozen soil原状冻土