Question

around the world,in the world的区别

Answer 1

around the world 和 in the world, 差别在于 around 和 in 这两个词。
当然意思某些时候是几乎一样的，指“全世界”。但around有点强调环球的概念，比如环球旅游就得用around the world了。
in the world（用于加强语气）
Everyone else is stressed but he doesn't seem to have a care in the world.别人都很紧张，但他好象一点也不在乎。
There's no need to rush-we've got all the time in the world.没有必要急急忙忙的---我们有的是时间。
What in the world are you doing?你到底在干什么？

Answer 2

around the world 和 in the world, 差别在于 around 和 in 这两个词。
当然意思某些时候是几乎一样的，指“全世界”。但around有点强调环球的概念，比如环球旅游就得用around the world了。

Answer 3

in the world（用于加强语气）世界上
Everyone else is stressed but he doesn't seem to have a care in the world.别人都很紧张，但他好象一点也不在乎。

all over the world
adv.全世界
all over the world 中,all 是副词“完全地”修饰over“遍及”这个介词 + the world做介词的宾语