[xìn hào]
signal; semaphore; gun
									
										an audible signal
										音频[响]信号
									
									
									
										semaphore
										臂板信号{铁道}
									
									
									
										light signal
										灯光信号
									
									
									
										identification signal
										识别信号
									
									
									
										distress signal; SOS
										遇难信号{航海}
									
									
									
										hash
										杂乱信号{无}
									
									
									
										A train must not pass a signal that is at danger.
										火车切不可越过危险信号。
									
									
									
										Signals are made with flags or lamps.
										信号是用旗或灯发出的。