swim的过去式： swam；
swim：v.游水；游泳；游泳(作为娱乐)；游；
swim的过去分词： swum
We swam in the lake.
我们在湖里游泳。
His head swam and he swayed dizzily.
他感觉天旋地转，摇晃起来。
I turned and swam a few strokes further out to sea
我转身向海里又游了几下。
温馨提示：
