副词
1. All passengers aboard fell into the river. 船上所有乘客皆落入河中。
2.
2. We must not take combustible goods aboard. 我们切不可带易燃物上车。
介词
1. They were the last two to go aboard the ship. 他们是最后两位上船的。
2. She went aboard the plane. 她上了飞机。