The ship is going very fast.

船走得真快。

Perhaps she makes about 25 knots an hour.

每小时可能有25海里。

The ship is really tossing. I'm afraid well fall down on deck.

船摇晃得很厉害，恐怕我们会滑倒在甲板上。

Don't worry. I've worn nonskid shoes.

别担心，我穿了防滑平底鞋。

The sea is very rough.

风浪很大。