mill seesaw

• 打磨秋千

mill seesaw的用法和样例：

例句

1. How many saws could a seesaw saw if a seesaw could saw saws?
   如果一个秋千可以锯锯子，那么一个秋千能够锯几把锯子？
2. A seesaw can be turned into a ramp by placing blocks on one end, for example.
   打个比方，如果将秋千板拉到某一方，它就可以荡起来。