The police are concerned for the safety of the 12-year-old boy who has been missing for three days.

那个12岁的男孩失踪三天了，警方对他的安全感到担忧。

《牛津词典》

All will do so in a spirit that has been missing for a while-one of optimism.

所有人都会乐观地去这么做，尽管这种精神他们已经遗失一段时间了。

youdao

What has been missing from the agile literature is a solid, practical book on the specifics of developing large projects in an agile way.

关于敏捷开发的文字有许多，缺少的是一本在用敏捷方式开发大型软件项目细节方面的坚实且实用的书。

youdao

"That is the ingredient which has been missing in far too many places, for far too long.

VOA: standard.2009.07.11

and it struck me that that there was a lot missing from the picture that has been given in Washington as they were trying to set policies that would affect education, that would affect the regulation of entertainment in terms of understanding of young people's relationships to technology.

让我感到震惊的是,在整件事情上还有许多东西不为人所知,在华盛顿这些都展示于世人面前,正如他们在制定政策,能够影响教育的发展，影响娱乐业的行业规则,至于了解,年轻人与技术的关系。

麻省理工公开课 - 媒体、教育、市场课程节选

Some missing planes have never been found. Indonesia's airline industry has come under scrutiny in recent years after a series of crashes of both commercial and military aircraft in which hundreds of people have died.

VOA: standard.2009.08.02

An Italian journalist has been missing in Syria for 20 days, his newspaper La Stampa says.

BBC: Veteran Italian war correspondent missing in Syria

It appeals to exactly the kind of higher-priced, higher-quality crowd that McDonald's has been missing.

FORBES: Beyond Burgers

"Education is the one industry where innovation has been missing, " Mr. Klein said in an interview.

WSJ: Schools Chancellor Klein Resigns, Joins News Corp.