at the swimming pool和in the swimming pool

at the swimming pool和in the swimming pool swimming (at)还是(in) the swimming pool The boy is swimming at the pool.为什么是at the pool?用in the pool --------- Mike like swimming at the pool? i am swimming at the pool 为什么不是in the pool in the swimming pool 翻译成汉语 How many_____are there in the swimming pool? He wants to swimming in the pool. my ______brother is______swimming in the swimming pool i am swimming at the pool对 am swimming 提问 in the pool和at the pool I am swimming in the swimming pool改为一般疑问句