absence 接介詞 from表示“離開某地,不在某地”; 接介詞 at 或 in表示“不在某地而在他處”; 接介詞of表示某人、某物或者某事物“缺乏”或者“不存在”。而in absence意為“在缺乏或不存在的情況下”; in sb's absence意為“當某人不在時,在某人離開時”; in the absence of則意為“在缺少…時”。
例句：
When it came to cleaning up afterwards, Anne was conspicuous by her absence.
後來到做掃除時，本應在場的安妮卻因為不在而引起了注意。
His absence went unremarked.
沒有人注意到他不在場。
There is more to good health than the mere absence of disease
身體健康不僅僅指不生病，還包括更多。
The presence or absence of clouds can have an important impact on heat transfer
有無雲層對熱量的`傳遞會產生重要的影響。
The official reason given for the President's absence was sickness.
對外公佈的總統未到場原因是身體有恙。