n.活塞；跳水的人；馬桶搋子
The plunger is clamped into the crosshead. 活塞與滑塊相連接。
The plunger should be withdrawn from sleeve. 柱塞應(yīng)從套筒里抽出來。
He took a photo of the plunger in action. 跳水者正在跳水時, 他拍了張快照。
