We are probably all familiar with background music in films, which has become so ubiquitous as to be noticeable in its absence.

我们可能都熟悉电影中的背景音乐，它已经变得如此普遍，以至于如果没有背景音乐便会显得很突兀。

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People who can't see the image need a description they can read in its absence.

人们看不见图象时需要一个替代描述。

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People get a big chunk of their identity from work, and in its absence, you need to redefine yourself.

职业在人的身份认知中占据着很大的一部分，一旦离开工作，人们就需要重新进行自我定义。

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In its absence, military responsibilities for Africa remain split between CENTCOM, EUCOM, and PACOM.

CENTERFORSECURITYPOLICY: AFRICOM proceeds apace

But even in its absence, condition number two is beginning to obtain in the United States.

CNN: What if abortion became a non-issue?

In its absence, they estimated that roughly 6 percent of small businesses would hire.

FORBES: Starbucks, the Jobs Crisis, and the Limits of Corporate Benevolence