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》

After one of Britain's biggest police searches, the bodies of two ten-year-old girls missing for 17 days from their homes in Soham, Cambridgeshire, were discovered in a nearby wood.

ECONOMIST: After the deluge