词语guard signal
解释保险信号(防护信号)
词性名词
guard signal〔名词〕保险信号;n.警戒信号详细»
guard signal〔名词〕告警信号,保险信号详细»
guard signal〔名词〕告警信号详细»
guard signal〔名词〕保险信号,防护信号详细»