Pay attention to the flashing lights on the bus, and stop when the lights are red and the STOP arm is extended.

注意车上的闪光灯，如果红灯亮了或标记停止的手臂伸出的话立刻停车。

youdao

He flung out an arm to stop her from falling.

他猛伸手臂扶她，她才没有跌倒。

《牛津词典》

I grabbed his arm to stop myself from falling.

我抓住他的手臂以免自己摔倒。

《牛津词典》

On the tape, Kevorkian injects muscle relaxant into Youk's arm to stop his breathing, and then injects potassium chloride to stop his heart.

CNN: Kevorkian Case: Kevorkian trial set

Enroth kicked away Gagnon's shot from in close and then, with his back to the play, Enroth reached out blindly with his right arm to stop Ladd's shot from going into the open net.

WSJ: Jets remain in the hunt with 2-1 win over Sabres

One aim of the reorganisation at UBS is to stop its investment-banking arm from funding itself with inexpensive capital thrown off by the wealth-management arm.

ECONOMIST: Bank strategies