名词达摩克利斯，为叙拉古(Syracuse)暴君Dionysius的宠信

1. 达摩克利斯之剑;随时可能发生的危险
If you say that someone has the Sword of Damocles hanging over their head, you mean that they are in a situation in which something very bad could happen to them at any time.

e.g. As a Grand Prix driver, you have the Sword of Damocles hanging over your head at every moment.
作为国际汽车大奖赛的车手，随时都有可能发生事故。