at/in/on swimming pool有何区别

at/in/on swimming pool有何区别 swimming (at)还是(in) the swimming pool at the swimming pool和in the swimming pool in the pool at the pool 有什么区别? The boy is swimming at the pool.为什么是at the pool?用in the pool 在游泳池里应该是in the swimming pool还是on the swimming pool in the pool和at the pool有什么区别［详细点］ i am swimming at the pool 为什么不是in the pool swimming pool和a swimming girl中的swimming有什么区别? in the corner,at the corner or on the corner有何区别 Where is he swimming?回答At the pool.(1)还能用In the/a pool.(2)Wh must we walk quickly at swimming pool?