seesaw

The two children sat on opposite ends of the seesaw, pushing off the ground with their feet.

(Chinese) 两个孩子坐在跷跷板的两端，用脚蹬地起落。

The old playground had a metal seesaw that creaked every time someone went up and down.

(Chinese) 旧操场上有一个金属跷跷板，每次有人上下起落时都会发出嘎吱声。