Unell于内尔UNabbr.(=United Nations) 联合国pron.<口>人，事物，家伙，东西unfractionated heparin普通肝素Unechte Gesamtschulden不真正连带债务unmarked present tense非标记现在时态unmanned helper engine无人驾驶辅机unconstrained velocity速度无约束undemocratic decisions专制的决定uncontrolled particles无控粒子unbleached softwood KP未漂硫酸盐浆undistributed dividend未分股利unperceived inbreeding非预期近交