1、跷跷板：seesaw

2、游乐场上有一处沙坑、一块跷跷板和一个秋千架。There was a sandpit, a seesaw and a swing in the playground.

3、在弟弟的要求下父亲为我们搭了个跷跷板。Upon my brothers request, father built us a seesaw.