swimming pool中的swimming为什么要双写加ing重点是为什么要加ing

swimming pool swimming pool和a swimming girl中的swimming有什么区别? 游泳池 SWIMMING POOL怎么样 swimming pool中文意思 swimming pool中的swimming为什么要双写加ing重点是为什么要加ing swimming (at)还是(in) the swimming pool There are many people swimming in the pool.look at the people swimming in the pool.这两句话中的swimming in the pool 在句中各起什么作用,做什么成分? in the swimming pool 翻译成汉语 --------- Mike like swimming at the pool? i am swimming at the pool He wants to swimming in the pool. I am swimming in the swimming pool改为一般疑问句 i am swimming at the pool对 am swimming 提问 The boy is swimming at the pool.为什么是at the pool?用in the pool at the swimming pool和in the swimming pool有何不同 要速度 Lily swims in the swimming pool对in the swimming pool提问 There is a 20-metre-long swimming pool there.The swimming pool is ()()() 在游泳池里应该是in the swimming pool还是on the swimming pool