at the pool or in the pool?

in the pool&at the pool in the pool和at the pool in the pool at the pool 有什么区别? at the swimming pool和in the swimming pool The boy is swimming at the pool.为什么是at the pool?用in the pool swimming (at)还是(in) the swimming pool i am swimming at the pool 为什么不是in the pool in the pool和at the pool有什么区别［详细点］ at the library at the mall at school at the pool 和 in the li 您好!我想问您In the pool and at the pool 的区别,它们可以翻译成同一个意思吗? Where is he swimming?回答At the pool.(1)还能用In the/a pool.(2)Wh Look!Who is -------------------in the the pool?