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。