What time must I go on board?

我应在什么时候上船？

What time shall we go on board?

我们什么时候上船？

May we go on board to see your cockpit?

我们上飞机看看驾驶舱好吗？

The ship is about to start. Let’s go on board.

船就要开了，我们上船吧。

Steven wants to go to Dalian by ship. He has bought his ticket. And now he is about to go on board.

史蒂文想要乘船去大连。他已经买了票了。现在他正准备登船。