swap set

例句：

1. 1. They swapped their old clothes for new ones.
   他们用新衣服交换旧衣服。
2. 2. The students swapped notes during the test.
   学生们在考试期间互相交换笔记。
3. 3. Swap your old car for a new one.
   把你的旧车换成一辆新车。