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：
She concocted some elaborate story to explain her absence.
她精心編造了解釋她不在場的一些謊言。
The case was dismissed in the absence of any definite proof.
此案因缺乏確鑿證據而不予受理。
She took advantage of the children's absence to tidy their rooms.
她趁孩子們不在時收拾了他們的房間。