基本解释[机械工程]烟火型推进剂英汉例句双语例句Upon vehicle impact, a pyrotechnic propellant charge is ignited electrically.车辆发生碰撞时，电子点燃焰火式推进剂填料。pyrotechnic propellant更多例句专业释义机械工程烟火型推进剂