mean the world to sb
是（某人）的一切、对（某人）来说非常重要
- Her children mean the world to her.
她的几个孩子就是她的一切。
on top of the world
极度幸福、非常幸福
- She was feeling on top of the world.
她感到自己是世界上最幸福的人。 - Two months before she gave birth to Jason she left work feeling on top of the world.
生贾森前的两个月，她辞工回家，感觉无比幸福。
延伸阅读：与极度幸福（extreme happiness）相关的英语习语
the best of both/all possible worlds
两全其美、两头受益、旱涝保收
- She works in the city and lives in the country, so she gets the best of both worlds.
她在城市工作却住在乡村，可以尽享两种生活的好处。 - If you enjoy the coast and the country, you'll get the best of both worlds on this walk.
你要是喜欢海滨和乡村，那么这次散步你会一举两得。
be worlds apart
（在态度、看法等方面）有天壤之别、截然不同
- They are worlds apart in their political views.
他们的政治观点截然相反。
go/come up in the world
飞黄腾达、发迹
- Roger and Ann have gone up in the world - these days they only ever travel first-class.
罗杰和安发迹了——现在他们旅行只坐头等舱。
go/come down in the world
潦倒、落泊
- They used to live in a big house with lots of servants, but they've come down in the world since then.
他们曾经住在一所大房子里，仆役成群，可后来家道中落。
do sb the world of good
使某人感到更健康（或更高兴）
- A change of job would do you the world of good.
换一下工作会对你大有好处。 - We had a week away in the sun and it's done us both the world of good.
我们外出到一个阳光明媚的地方度了一个星期的假，这对我俩的身心都十分有益。
world of difference
很大差别、完全不同、是两码事
- There's a world of difference between liking someone and loving them.
喜欢一个人和爱一个人完全不是一回事。 - There's a world of difference between the service in the two hotels.
这两家宾馆的服务有着天壤之别。
the (whole) world over
世界各地；全世界
- People are basically the same the world over.
世界各地的人基本上都一样。
(a) brave new world
美好的新世界（本欲改善人们的生活，实则带来预料不到的问题）
- the brave new world of technology
科技进步的美好新世界
dead to the world
熟睡、沉睡、酣睡
- "Is Georgie up yet?" "I doubt it - she was dead to the world ten minutes ago."
“乔姬起床了吗？”“我看还没有--10分钟前她还睡着呢。”
