1 in every part of sth 到处:
The house is beautifully decorated throughout.房子里四处都装饰得很好看。The match can be watched live on television throughout the world.那场比赛全世界都可以通过电视直播观看。
2 from the beginning to the end of sth 从头到尾;在整段时间:
We didn't enjoy the holiday because it rained throughout.我们假期玩得不开心,因为整段时间都在下雨。