fish可數嗎

There are about 30 000 species of fish in the world.

世界上約有3萬種魚。

Fishing is good at high water.

高水位有利於釣魚。

How can you tell what sex a fish is?

你怎樣辨別一條魚的雌雄？

I don't like fish.

我不喜歡魚。

You need a licence to fish in this river.

你在這條河裏釣魚要有許可證。