You can use world to describe someone or something that is one of the most important or significant of its kind on earth.
China has once again emerged as a world power.
中国再次成为一个世界强国。
worlds
The world is the planet that we live on.
The satellite enables us to calculate their precise location anywhere in the world.
卫星使我们能够计算出他们在世界上任何地方的精确位置。
The world refers to all the people who live on this planet, and our societies, institutions, and ways of life.
The world was, and remains, shocked.
世人当时感到震惊,现在仍然如此。
He wants to show the world that anyone can learn to be an ambassador.
他想告诉世人,任何人都能通过学习成为一名大使。
You can use world in expressions such as the Arab world, the Western world, and the ancient world to refer to a particular group of countries or a particular period in history.
Athens had strong ties to the Arab world.
雅典与阿拉伯世界有着紧密的联系。
Someone's world is the life they lead, the people they have contact with, and the things they experience.
His world seemed so different from mine.
他的生活圈子与我的似乎是那么的不同。
You can use world to refer to a particular field of activity, and the people involved in it.
The publishing world had certainly never seen an event quite like this.
出版界当然从未见过类似的事情。
You can use world to refer to a particular group of living things, for example, the animal world, the plant world, and the insect world.
When it comes to dodging disaster, the champions of the insect world have to be cockroaches.
谈到躲避灾难,昆虫界的冠军非蟑螂莫属。
the best of both worlds
If you say that someone has the best of both worlds, you mean that they have only the benefits of two things and none of the disadvantages.
Her living room provides the best of both worlds, with an office at one end and comfortable sofas at the other.
她的起居室两全其美,一端是个办公室,另一端有舒服的沙发。
do someone a world of good , do something a world of good
If you say that something has done someone a world of good, you mean that it has made them feel better or improved their life.
Just sit for a while and relax. It will do you a world of good.
坐一会儿放松放松,你就会觉得舒服多了。
what in the world , who in the world , where in the world
You can use in the world in expressions such as what in the world and who in the world to emphasize a question, especially when expressing surprise or anger.
What in the world is he doing?
他到底在干什么呢?
in an ideal world , in a perfect world
You can use in an ideal world or in a perfect world when you are talking about things that you would like to happen, although you realize that they are not likely to happen.
In an ideal world Karen Stevens says she would love to stay at home with her two-and-half-year-old son.
卡林·斯蒂芬斯说,在理想的生活中,她非常愿意呆在家里照料两岁半的儿子。
the outside world
You can use the outside world to refer to all the people who do not live in a particular place or who are not involved in a particular situation.
For many, the post office is the only link with the outside world.
对许多人来说,邮局是与外界联系的惟一纽带。