He cleared up the question of his absence in the presence of all his classmates.

他当着全班同学的面澄清了他缺席的疑团。

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All of the above can be conditional upon the operating system type and revision, time of day, arbitrary user-defined classes, presence or absence of files, directories, or data in files, and so on.

上述所有这些根据操作系统类型和修订版本、一天中的时间、任意用户定义的类、文件中文件、目录或数据的有无等等可以是有条件的。

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Its influence persists in the presence of family stressors such as the father's absence and maternal anxiety or depression.

若存在家庭压力，如父亲离家以及母亲焦虑或抑郁，严重体罚的影响就会持续下去。

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Lawyers and experts on internet policy say no court case has ever turned on the presence or absence of such an automatic e-mail footer in America, the most litigious of rich countries.

ECONOMIST: Legal disclaimers

That, in the end, the absence of the deal is anti-consumer, not the presence of it.

FORBES: The AT&T-T-Mobile Deal: Of Course It's Pro-Consumer