life rope gun[建] 射绳枪;射绳枪
service life of gun炮寿命
life of gun-barrel炮管寿命
life-saving gun救生信号枪
life line throwing gun救生索发射枪;救生抛绳枪
life line rescue gun射绳枪
bridge life line rescue gun跨越救生绳枪
gun life火炮寿命
life expectation line throwing gun救生索发射枪