如果指在光秃秃的山上,用on,如果强调在树丛中  用in  ,这要看语境的  You  can  ski  on  the  hills. 你能在山上滑雪. Mr  Jones: Walk  on  the  hills.   OK? 琼斯先生：“在山上漫步”可以吧  The  creek  originates  in  a  spring  in  the  hills. 小河源自山泉. The  kidnappers'  lair  was  an  old  farm  in  the  hills. 绑架者的藏身处是山里的一座旧农场. He  earned  his  living  cutting  firewood  in  the  hills  . 他靠在山上砍柴为生.
在丘陵上的英语翻译,是on the hills还是in the hills