swim的形式有：
swims， swam，swum， swimmingThe bank seemed to swim before my eyes .银行似乎在我眼前旋转起来。
She can swim two widths now .她现在能在游泳池里横向游一个来回了。
The scene was swimming around natalie .这个场面在娜塔丽面前旋转。
My little sister has a red swimming cap .我小妹有一顶红色游泳帽。
Swimming was his favourite recreation .游泳是他最喜爱的娱乐活动。
