The result is that while about forty percent of Chinese primary school students need glasses, only three percent of Australian children do.

结果是，大约40%的中国小学生需要戴眼镜，而只有3%的澳大利亚孩子需要。

youdao

According to a study by Australian National University, Australian children and Chinese children have the same level of eyesight before they start school, but once they enter primary school, Chinese children only spend about an hour a day outside, while Australian children spend three to four hours each day in the sunshine.

澳大利亚国立大学的一项研究显示，澳大利亚的孩子和中国的孩子在入学前的视力水平相同。但是一旦他们进入小学，中国的孩子每天只会在户外度过一个小时，而澳大利亚的孩子每天在阳光下待三到四个小时。

youdao

There are three primary reasons to create Value Stream Maps: objectivity, clarity, and persuasion.

创建价值流图主要有三个原因：客观性，清晰性以及说服力。

youdao

In two thousand three, the government of Kenya established a program of free primary education for all children.

VOA: special.2009.08.24

This Cambridge History of Food talks about three separate primary phases in human food evolution: one beginning a million and a half years ago, another about 700,000 years ago, and then the 10,000 year ago one that I talked about just a moment ago.

剑桥饮食史》描述了,人类饮食结构演化过程中的三个不同阶段,其一,始于一百五十万年前,其二,距今约七十万年,其三,距今一万年,我们刚讨论过了

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

She says one slum in Nairobi,Mathari,has only about three public primary schools nearby.

VOA: special.2009.08.24

Kepler completed its primary three-and-a-half year mission last November, Nasa says, and is now in an extended mission phase.

BBC: Nasa's Kepler telescope hobbled by faulty wheel

In tomorrow's primary, three wives, one husband, and two brothers are running for a seat in the state assembly held by family members.

NPR: Political Families Circumvent California Term Limits

After North Carolina's primary, three previously undecided superdelegates endorsed Obama: North Carolina Democratic Party Chairman Jerry Meek, North Carolina DNC member Jeanette Council and California DNC member Inola Henry.

CNN: Superdelegates await Clinton's next move