elementary
单词辨析：
强调基本的、简单的，或指事物处于初级阶段的，通常作定语。
The lawyer was ignorant of even the most elementary facts.
那位律师连最基本的事实都不知道。
It might be better to send them to a private elementary school.
送他们到私立小学或许比较好。
Here it refers to elementary education, starting with simple reading and basic skills.
这里指的是从简单阅读和基本技能开始的基础教育。
指作为事物的基础或本质的，通常作定语。
elemental features/forces
基本特征/自然力
Love and hatred are two of the most elemental human emotions.
爱和恨是人类最基本的两种情感。
指反映事物本质的，强调重要性。
In all cases, the fundamental principles remain the same.
在任何情况下，基本原理保持不变。
There are fundamental differences between your political beliefs and mine.
你我的政治信仰根本不同。
指在重要性方面占据首位的，通常作定语。
Our primary concern must be the children.
我们首先要关心的必须是儿童。
Good health care is of primary importance.
良好的医疗保健是重中之重。
相关例句：
It's a fairly elementary course, so advanced learners won't get much out of it.
这是一门相当初级的课程，所以高水平的学生从中学不到多少东西。
This is an elementary question.
这是一个基本的问题。
In this paper, the elementary theory and methods of multiobjective optimization and genetic algorithm is introduced.
本文介绍了多目标优化和遗传算法的原理和方法，并对遗传算法进行了改进。
A proton is an elementary particle of matter.
质子是物质的基本粒子。
His lectures always proceed from the close to the distant and from the elementary to the profound.
他讲课总是由近及远，由浅入深。
They have compiled a collection of Elementary Readings on the Natural Scieces to help young people in their studies.
为了便于青少年学习，他们编了一套《自然科学小丛书》。