A shark is a fish.

鲨鱼是一种鱼。

A shark is a big fish.

鲨鱼是一种大鱼。

Oh, no! It's a shark!

哦，不！那是一条鲨鱼！

A shark has a tail and fin for swimming.

鲨鱼有尾巴和鳍用来游泳。

Without a fin, a shark can no longer swim and slowly dies.

没有鱼鳍，鲨鱼无法游泳并慢慢死亡。

If a shark is spotted near a beach, swimmers rush to land.

如果在海滩附近发现鲨鱼，游泳者会赶紧上岸。

A shark is a fierce marine animal.

鲨鱼是一种凶猛的海洋动物。

The teeth of a shark are very sharp.

鲨鱼的牙齿非常锋利。

We encountered a shark while diving.

我们在潜水时遇到了一条鲨鱼。

I saw a shark while snorkeling in the ocean.

我在海里浮潜时看到了鲨鱼。