a bundle of letters which had arrived for me in my absence.

我不在的时候寄给我的一捆信。

the problem of high sickness absence in the public sector.

公共部门因病缺席率高的问题。

The presence or absence of clouds can have an important impact on temperature.

云的有无对气温会产生重要影响。

In the absence of a will the courts decide who the guardian is.

在没有遗嘱的情况下，由法庭来指定监护人。