... 封离的无泵的真空系统 sealed pumpless vacuum system 真空系数 vacuum coefficient 防空系统 air defe e system; air defence system; air defense system; antiaircraft defence system ...
双语例句
1
As one of the main weapon and the information resources in the modern air-defencesystem, the viability of antiaircraft radar on the ground is confronted with serious threats.