Pupils mark their own homework: this is an important principle in Japanese schooling as it enables pupils to see where and why they made a mistake, so that these can be avoided in future.

学生们自己给作业打分：这是日本学校教育中一个很重要的原则，因为它可以学生们看到他们在哪里犯错以及为什么犯错，这样以后就可以避免这些错误。

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As proof of principle, Barbas's team has taken human cells and inserted a gene that their ZFR would recognise. They then used the recombinase to insert the gene into the cells' genome.

巴尔·巴斯的团队为了证实这一原理，他们在人体细胞中植入了他们的ZFR能辨识的基因，然后利用重组酶将基因植入到基因组细胞中。

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This is why more recent Expos have elected the theme as their central core and organizing principle.

这就是为什么最近几届世博会越来越多地选择将这种主题作为其核心理念与组织原则。

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"We have now just enshrined, as soon as I sign this bill, the core principle, that everybody should have some basic security when it comes to their health care."

VOA: special.2010.03.24

The rebels see the Tutsi-dominated army, which has also been accused of grave human rights violations against Hutus, as their principle enemy.

BBC: Analysis: Burundi's shattered hopes

Then there are the famous "additional security clauses" acknowledging the Russian army's right to be stationed there and to patrol, as scandalous in principle as they are vague in their modalities of application.

CENTERFORSECURITYPOLICY: Russia is brazen, Europe weak

As a result, we spent a lot of time and resources to ensure that we identified and worked with entrepreneurs that not only had sound and scalable business ideas, but equally as important, that they had social and community responsibility built in as a core principle of their business model.

FORBES: Jose Corona of Inner City Advisors on Inner City Sustainability and Job Creation