Her bottom lip quivered and big tears rolled down her cheeks.她的下唇颤抖着，豆大的泪珠顺着面颊滚落下来。The blades of grass quivered in the wind.草叶随风颤动.The lip of that confounded cub, the second mate, quivered visibly.二副, 那个惊慌失措的小伙子的嘴唇明显地哆嗦起...
泵的抽气速率与气体的性质有关.Lashing velocity of pump is concerned with nature of air.现在已经采用了低温吸附技术和吸气离子泵的近代电子抽气设备.Recent electronic means of pumping using low temperature sorption techniques and getter - ion pumps have been introduce...