westbound(形容词/副词)指“向西行的;西行方向的”,常用于交通、航班、列车、车道或路线等语境。(也可作名词,指“向西行驶的车辆/列车/航班等”。)
/ˈwestbaʊnd/
The westbound train leaves at 6 p.m.
西行的火车下午六点出发。
Traffic was heavy on the westbound lanes because of an accident near the bridge.
由于桥附近发生事故,向西方向的车道交通非常拥堵。
westbound 由 west(西方)+ bound(朝向……的;开往……的)构成。这里的 bound 表示“以某方向为目的地/行进方向”,常见于 northbound, southbound, eastbound 等同类词。