it can swim with its fins and tail in the water 指什么东西或动物

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• it can swim with its fins and tail in the water 指什么东西或动物
• 1.There'e two brothers.One lives on one side(边),and the other is on the other side.______3.It lives in a case.When you want to write something,it can help you.______4.It walks all the time,but never(从不) leaves its place.______5.It can swim in the water.And it has got a tail(尾巴) and fins(鳍).______2.It is black when it's clean and white when it isn't clean.______1.When people say something,they can hear.But they can' t see each other(互相).
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