r. on a ship, train, plane or other vehicle
r. on first or second or third base
r. side by side
r. part of a group
adv. 在船上, 在火车上, 在飞机上
prep. 在...之上
1. We welcomed the new passengers aboard the ship.
我们欢迎新乘客登船。
2. The children were excited to be aboard the train.
孩子们很兴奋能坐上火车。
3. Please fasten your seatbelts while aboard the airplane.
请在飞机上系好安全带。