One who takes sudden action.

突然行动者；闯入者；冲入者。

A diver.

潜水者；跳水者。

A cylinder used as the piston of a pump, the dasher of a churn, or the like.

唧筒之活塞；(搅乳器等之)搅拌装置。

Reckless gambler.

【口】滥赌者；狂赌者。