Proving his innocence has become a matter of honour.

证实他的清白已经成了一件道义上的事。

《牛津词典》

youdao

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Many have become internally displaced. She says the situation of children in internment camps in Sri Lanka is a matter of real concern.

VOA: standard.2009.09.16

It was then in a matter of moments, that I decided that I had to find out why and become happier.

也就是在那时，我决定要找出原因，变得快乐。

哈佛公开课 - 幸福课课程节选

"It creates a societal change, an economic growth, it creates jobs.As the world has become so interconnected, it's provided an opportunity for entrepreneurs no matter where they are to access any market that exists,"

VOA: standard.2009.12.04

"The possession of a Blue Flag has become a matter of prestige for coastal resorts, "he said.

BBC: NI beaches 'quality' flagged

But the spontaneous outbreak of public support has become a matter of deep concern for Mr Singh's administration.

BBC: India corruption: Hazare heaps pressure on government

Your credit card charges, telephone calls and where you keep your underwear could all be scrutinized and might become a matter of public record.

FORBES: Leave Your Taxes Behind