Definition: on or onto a plane, ship, bus, or train Level: C1
欢迎乘坐飞往巴黎的BA109航班。
Welcome ___aboard flight BA109 to Paris.
欢迎乘坐飞往古罗马的航班。
Welcome ___aboard on the flight to ancient Rome.
请确保在火车出发前上车。
Please ensure you are ___aboard the train before it departs.
