He opened the door in response to a knock. Much to his surprise, it was a long-separated friend.

他开门看看是谁敲的门，真是令他大吃一惊，原来是一个分开很久的朋友。

youdao

Restrictions which have long separated domestic and international calls have gone.

ECONOMIST: Deregulation in Japan

He stood like that for a long time, separated from a live concert by two screens.

FORBES: Does the Internet Make You More or Less Connected?

East of the River Adur, the downs run in three long plateaux, separated by stream and river valleys.

BBC: England��s ghostly South Downs Way