It makes a world of difference whether precautions are taken or not.是否采取预防措施是大不一样的。It may not matter to you, but it makes all the difference in the world to me. = It makes a world of difference to me. 这对你而言可能不算什么，但对我来说却至关重要。A little sympathy makes a world of difference to someone who's been badly treated.对于那些遭到虐待的人来说，一点点同情心就会让他们觉得备受关爱。