At an agreed signal they left the room.
收到约定的信号后，他们离开了房间。
Turn left at the signal light.
在信号灯处左转。
Turn on your left signal before starting to turn.
开始掉头前打开你的左转向灯。
Turn off your hazard lights and turn on your left turn signal.
关闭危险信号灯，打开左转灯。
She made a signal with her arm for a left turn.
她用手臂示意向左拐弯。
She given a left turning signal with her arm.
她用胳膊发出左转弯信号。
The launch of the first radio search for an alien signal was left to others.
启动第一次外星文明信号的搜寻只好留给他人。
The launch of the first radio search for an alien signal was left to others.
启动第一次外星文明信号的搜寻只好留给他人。
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