illness可數名詞嗎

例句：

1、Attitudes to mental illness have shifted in recent years.

最近幾年對精神病的態度已有所改變。

2、He boasts of dodging military service by feigning illness.

他炫耀自己通過裝病來逃避服兵役。

3、She was determined not to let the illness take hold again.

她決心不讓疾病再次擊垮自己。