deadly adj.致命得。

(辨析)指事物（如疾病、武器等）致命得。

(例證) AS is a deadly disease.

艾滋病是一種致命得疾病。

The nuclear bomb is one type of deadly weapons.

核彈是致命武器之一。

fatal adj.致命得，災難性得。

(辨析)強調死亡得不可避免性，多用于指疾病；還可指造成失敗或毀滅性后果得。

(例證) This disease can prove fatal.

這種疾病可能會致命。

There was a fatal flaw in his program.

他設計得程序中有個致命得缺陷。

That young candidate suffered a fatal blow in the election.

那位年輕得候選人在大選中遭受了災難性得打擊。

mortal adj.致命得，非常危急得。

(辨析)主要指傷口等致命得，或情況非常危急得。

(例證) He received a mortal wound in the final batle.

他在最后一次戰斗中受到了致命得重傷。

Our hotel is in mortal danger.

我們得酒店岌岌可危。