1的單數形式，illness

illness就是單數形式。

n. 病疾病The illness is usually terminal.

這種病通常爲不治之症。

She is still weak after her illness.

她病後仍然虛弱。

The illness was diagnosed as cancer.

此病診斷爲癌症。

Illness had taken a heavy toll on her.

疾病對她的身體造成極大的損害。

Illness had put a brake on his progress.

疾病中止了他的進展。