Stand the fish tank on a firm base.

　　把魚缸放在牢固的基座上。

　　The fish return to the river as adults in order to breed.

　　這種魚長成以后回到河中產(chǎn)卵。

　　This fish has a lot of bones in it.

　　這種魚多刺。

　　How many fish did you catch?

　　你捕到幾條魚？

　　The eyes of some fish have a greater sensitivity to light than ours do.

　　有些魚的眼睛對光比我們敏感。