absence of

Original mail returned in the absence of the addressee.

收信人不在,原件退回.

Her absence of mind during driving nearly caused an accident.

她驾车时心不在焉,几乎肇祸.

The absence of children at Christmas preyed on Liz's mind.

利兹因为圣诞节时孩子们不在而一直心神不宁。