They have been missing for a long time now.

到现在他们已经失踪很长时间了。

《柯林斯英汉双解大词典》

My gloves have been missing for ages.

我的手套已经丢了很久了。

《牛津词典》

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》

Failing to fetch me at first keep encouraged, Missing me one place search another, I stop somewhere waiting for you.

VOA: special.2009.04.12

Right now we have actions, strategies for people to take, and we know what the outcomes are, but we're missing something that will make this a game.

目前我们涉及行为,策略,局中人,而且我们知道不同的结果,但是我们忽略了一个博弈必备的因素

耶鲁公开课 - 博弈论课程节选

For example, in some South Asian and Muslim countries it is estimated that millions of women are missing.

VOA: special.2010.06.16

Many missing persons who have been missing for a long time are still not found.

CNN: Missing persons could be just next door

"I've been kidnapped, and I've been missing for 10 years, " she told the dispatcher.

WSJ: Three Women Missing for Years Found Alive in Cleveland, Ohio

The search for a racehorse trainer who has been missing for three days has been extended.

BBC: Owen Brennan: Hunt for racehorse trainer extended