Nitration using N2O5 is a new clean technique.

N2O 5硝化是一种新型的绿色硝化技术。

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This technique not only creates a clean document but it will thrill your translation team!

这种技术不仅创建了一个清晰的文档，而且它使翻译小组兴奋！

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The technique, believed to be the first of its kind, also produces clean plastic that can be recycled and used to produce new products.

这一技术据称是行业首创，还可以回收制造出干净的塑料，并用于制造其他产品。

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He told BBC News that ice-coring "doesn't really work as a viable technique to do long-term, clean access and exploration of sub-glacial lake environments - because of the issues with cleanliness and sterility".

BBC: 'New frontier' of Antarctic lake exploration

In the run-up to the vote on May 6th, in which the Liberals, Labour, and Greens increased their strength at the expense of the Christian Democrats, the Netherlands deployed a technique that did not prevent politicians from promising the moon, but at least forced them to come clean about the cost.

ECONOMIST: Dutch courage