Unell于内尔UNabbr.(=United Nations) 联合国pron.<口>人，事物，家伙，东西undisciplined behavior缺乏纪律的行为； 任性的态度Unmanned Lunar Orbiter无人月球轨道飞行器unbalance of structure结构失衡uncoupling capacitance去耦电容uncorrected absorbance未校正吸光度undulating composition成分起伏unbounded control mode[计] 无约束控制方式undemanding occupation要求不严格的职业unquestioning faith.绝对的忠诚unbleached waste paper本色废纸