A fishing boat came out of nowhere, dead ahead.一艘渔船不知从什么地方冒了出来,就在正前方。The river is eight miles away dead ahead.这条河就在正前方八英里处。Their house is directly ahead. = It's directly in front of us.他们的房子就在正前方。Our route lay straight ahead and downhill.我们的路线就在正前方,是下山路。