她走到路边，招手叫了一辆出租车。

She stepped into the road and ___hailed a taxi.

如果你看到汽车、公共汽车或其他车辆，只需招手叫停他们并请求帮助。

If you see a car or a bus or some other vehicle, just ___hail them and ask for help.

被困的登山者拼命地向一架经过的直升机挥手呼叫。

The stranded mountaineer desperately ___hailed a passing helicopter.