Basic
- forming the most important or most necessary part of something基础的，基本的，根本的。
the basic principles of chemistry 化学的基本原理
at the simplest or least developed level基本的，最简单的，最初级的
the basic skills of programming编程基本技巧
at the simplest or developed level基本的，最简单的，最初级的
the basic skills of programming编程基本技巧
Essential 语气比basic和fundamental强。强调必不可少。暗含某物如缺少某部分，则失去本质特征。
extremely important and necessary极其重要的，必不可少的
Window locks are fairly cheap and absolutely essential.
The essential part quality or feature of something is the most basic one 最基本的，本质的。
The essential difference between Sam and me was the fact that I took life seriously.
Fundamental 侧重指作为基础根本的抽象的事物。
Relating to the most basic and important parts of something根本的，基本的，基础的
Very necessary and important不可少的，十分重要的
This is out of world.
do sth/sb the world of good对 大有好处，改善。
a world away from sth和 截然不同，有天壤之别
his new fancy car is a world away from his first tiny car
a/the world of difference完全不同，是两码事
how/why/what in the world用于强调表示惊讶不悦。到底究竟。等于what on earth
How are you?
回答：how are you?
fine, thanks
Not bad
Pretty good
I'm awesome
I'm doing well, thanks
Good.
What's up
Yo
what's up其实只是问候语，可以回复：
what's up
nothing much
not a lot
nothing
oh, just as usual
just the same
oh, gosh, all kinds of stuff
not too much
hey(man/dude)
Not much, how about you?
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