全军覆没的英文：
completely destroyed

参考例句：

It was within the claws of the Warsaw pincers that the Polish Army fought and died
波兰陆军是在同对华沙的钳形攻势的合围进行博斗而全军覆没的。

The British 1st Airborne Division, which had been dropped near the city, lost all but 2,163 of some 9,000 men.
降落在该市附近的英国第一空降师几乎全军覆没，九千人只剩下二千一百六十三人。

And now, O Roman Fathers! Send help to our army at once, or every man will be slain, and our city will be taken.
现在，噢，罗马元老们，立刻派兵援助我们的军队吧，否则，就要全军覆没，我们的城市就要陷落了。

completely是什么意思：
adv. 完全地，彻底地，完整地

Complete power corrupts completely.
绝对的权力造成绝对的腐败。

completive interjection
补足叹词

The task is complete.
任务完成了。

It is completely unverifiable.
这个完全无法核实。

It is the first complete revision of the dictionary since it was completed in 1928.
也是该词典于1928年编纂完毕后的第一次完整的修订。

destroyed是什么意思：
v. 破坏，摧毁；消灭，杀死

The town was destroyed by the earthquake.
整座城镇被地震毁灭了。

They decide to destroy the windmill.
他们决心摧毁风车。

To destroy or hinder the efficiency of; frustrate.
使不起作用使无效或限制其效力的发挥；阻挠、挫败

Acids in the stomach destroy the virus.
胃酸能杀死病毒。

Destroy microorganisms or pathogens by cleansing.
通过净化来消灭微生物或病原体。