You need a licence to fish in this river.
你在这条河里钓鱼要有许可证。
We enjoyed a day's fishing by the river.
我们在河边享受了一天垂钓之乐。
In the wild, this fish can reach a weight of 5lbs.
这种鱼在自然生存环境中可以长到5磅重。
Stand the fish tank on a firm base.
把鱼缸放在牢固的基座上。
The fish return to the river as adults in order to breed.
这种鱼长成以后回到河中产卵。