用一系列介词如across,along,over,to,up,down,through,round,from等~

across prep.穿过；横过；在……的对面/adv.从一边到另一边
across the contry 全国
along prep.沿着/adv.向前；一道；一起
along with 同……一起（一道)=in company with=together with
come along 一道
get along/on well with sb./sth.和某人相处得很好；……进展很好
go along 进步；前进；进行
You may have some difficulty at first,but you will find it easier as you go along.最初你或许有些困难,但进行下去你会觉得比较容易.
over adv.结束
（all) over again 再次=once again
over and over/again and again 一再地；再三地；一而再,再而三
=repeatedly; again and again
overall adj.总的；综合的