To cross the Rubicon means to make a decision of permanence.

“to cross the Rubicon”意味着做出一个永久的决定。

That is not the case with today's expression – to cross the Rubicon.

今天的表达方式并非如此：to cross the Rubicon（破釜沉舟；下重大决心；采取断然行动）。

In fact, the expression to cross the Rubicon, in English, means something very similar.

事实上，英语中to cross the Rubicon 的意思非常相似。

Julius Caesar decided to cross the Rubicon River with his army, and he began a civil war in ancient Rome - in the Roman Republic at the time.

尤利乌斯凯撒决定率领他的军队渡过卢比孔河，他在古罗马——当时的罗马共和国——开始了一场内战。