If you keep rodents in a very rich environment, with lots of toys.

　　如果你把嚙齒類動物放在一個有許多玩具的豐富環(huán)境。

　　You will need lots of toys which you can rotate for the puppies.

　　你需要為它們準備大量的可重復使用的玩具。

　　He buys lots of toys for his child and he never quarrels with his wife.

　　他給他的孩子買很多玩具，而且他從不與妻子吵架。