Definition: to call or wave to someone to get their attention Level: C2
在这里等着，我去叫辆出租车。
Wait here while I ___hail a taxi.
如果你需要帮助，就挥手拦下一辆过路车。
If you need help, just ___hail a passing car.
我试图在拥挤的街道对面招呼我的朋友。
I tried to ___hail my friend across the crowded street.
