覆亡的英文：
fall (of an empire)

参考例句：

Ah, it was more than a eurasian army that had perished!
可是现在，覆亡的不仅仅是一支欧亚国军队而已。

fall是什么意思：
v. 落下；倒塌；摔倒；下降；减弱；阵亡
n. 摔倒；下降；秋天；垮台；陷落；瀑布
adj. 秋天的

Sleet is falling.
天上下起了冰雹。

fall into disfavour
失宠失众望

We observed the barometer fall. [The barometer was observed to fall.]
我们看见晴雨表下降。

All the expenses fall on me.
全部费用由我支付。

There was a light rain falling.
外面下着小雨。

empire是什么意思：
n. 帝国；君权

the dissolution of an empire
帝国的崩溃

The great empire began to crumble.
这个大帝国开始衰落了。

This defeat led to the disintegration of the empire.
这次战败道致了帝国的瓦解。

The dissolution of the empire was remarkably swift.
帝国非常迅速地瓦解了。

The empire Is in its meridian period.
帝国正处于全盛时期的。