SLabbr.透镜分光计(=lens spectrometer)abbr.海平面(=sea level)SLEV(=St.；Louis encephalitis virus) 圣路易士脑炎病毒

1. The upstream pumping mechanical seal was used as shaft sealing of vacuum plants.
   研究了上游泵送机械密封在真空装备轴封中的应用。