We fight as their brothers in arms.

我们要和他们像兄弟一样并肩作战。

Brothers in arms are brothers for life.

一为战友，终生兄弟。

When our brothers in arms are gone, (When our brothers in arms are gone!)

在我们的兄弟夭折时。

The two countries were on their way to becoming, in Polakow-Suranskys words, "brothers in arms."

正如普拉科-舒兰斯基在书中写到的，两个国家渐渐地变成了“手足兄弟”。