basic, elementary, fundamental的用法

basic a.基本的，基础的，既可用于具体事物，也可用于抽象事物。

He has a basic understanding of the problem. 
他对问题有基本的了解。

elementary a.初步的，初级的。

elementary school小学

With a funny rate that contains all the elementary rate constants as part of it.
一个有趣的速率包含所有基本的速率常数,作为它的一部分。

My little sister, Becky, was born that year, and I started Year One at Winston Elementary, near the military base.
我的妹妹，贝琪，在那年出生了，而我则开始在离军方基地不远的温斯顿小学上一年级。

All this is so elementary that one would blush to state it if it were not being constantly forgotten by those who coin and circulate the new slogans.
所有这些实在是太基本了，如果不是因为那些杜撰和传播新口号的人一再忘记这些的话，在这里都不好意思再提。

fundamental a.根本性的，一般只用于抽象的事物；必要的，必须的。

Honesty is a fundamental principle in dealing with others. 
诚实是与别人相处的基本原则。

We should direct our attention at the fundamental question.
我们应把注意力集中在这个基本问题。

This decision represents the fundamental interests of the people.
这个决定反映了广大人民的根本利益。

Independence and sovereign equality among states is a fundamental principle of international law.
国家的独立和主权平等， 是国际法上的一项根本原则。