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use [noun] as a signal
They used the fire as a signal.
他们用火作为信标。
信标
先理解核心含义，再看它在真实句子里的用法。
信标
a signal
They used the fire as a signal.
他们用火作为信标。
The lighthouse sends a signal to warn ships of the rocks.
灯塔发出信标警告船只注意礁石。
They used smoke as a signal to announce their location.
他们用烟雾作为信标来宣告自己的位置。
The GPS device lost the satellite signal in the tunnel.
GPS设备在隧道中丢失了卫星信标信号。
They used the fire as a signal.
他们用火作为信标。
The lighthouse sends a signal every night.
灯塔每晚发送信标。
Not this
We saw signal from the tower.
Use this
We saw a signal from the tower.
可数名词 signal 前需要不定冠词 a，表示单数泛指。
Not this
There is a signal on the road indicating the speed limit.
Use this
There is a sign on the road indicating the speed limit.
signal 指信号（如无线电或光信号），sign 指标志（如路牌），此处应使用 sign。
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Dictionary facts from BridgeDict normalized sources.