A proton is an elementary particle of matter that possesses a positive charge.

质子是带正电荷的物质的基本粒子。

《柯林斯英汉双解大词典》

A low wage for elementary school teachers, however, doesn't mean elementary education isn't important.

但是，小学教师的工资低并不表示小学教育不重要。

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Just having a strong teacher for one elementary year left pupils a bit less likely to become mothers as teenagers, a bit more likely to go to college and earning more money at age 28.

仅仅是在小学的一年里有一位优秀的老师，就会让学生们在青少年时期成为母亲的可能性降低一些，而上大学和在28岁时赚更多钱的可能性增加一些。

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But a national survey found that in recent years foreign language teaching decreased in public elementary and middle schools.

VOA: special.2010.06.17

What's a function, what's a derivative, what's a second derivative, how to take derivatives of elementary functions, how to do elementary integrals.

什么是函数,什么是导数,什么是二阶导数,如何对初等函数求导,如何进行初等积分

耶鲁公开课 - 基础物理课程节选

Well, it's a long time ago but it was elementary school, you know, maybe 3rd grade, 4th grade,

那是很久以前的事情了，应该是小学时候吧，那大概是三年级或者四年级，

美国的博物馆教育 - SpeakingMax英语口语达人

But on Friday, the panel said it also would study reusing a Newtown intermediate school or moving Sandy Hook Elementary to a former mental hospital campus that now includes a municipal town center and a youth academy.

WSJ: Sandy Hook's School Planning Divides Newtown, Conn.

Riding the froth of beer and grub sales, McMenamins converted a public elementary school and a 1914 dancehall in Portland in 1997.

FORBES: For Fun & (Minimal) Profit

As a former elementary school teacher and a dad of a 12 year old I know first-hand about how teaching and learning is quickly moving into a digital environment.

FORBES: Educators Dive into Digital