Seesawing
v. 使上下（来回）摇动( seesaw的现在分词 ); 玩跷跷板, 上下（来回）摇动
🗣️ 情景例句
You can see many posters that are put up before the movie opens.
每部电影首映前你都会看到铺天盖地的海报。
To facilitate carrying, rope or metal handles are indispensable and should be fixed to the boxes.
为便于搬运，绳子或铁把手不可缺少，并将其固定在箱子上。
Excuse me! Is this your pencil-box?
请问，这是你的铅笔盒吗？