There are those, you know, who, by circumstance, end up homeless.

你知道，有些人由于命运的原因最终变得无家可归。

《柯林斯英汉双解大词典》

For the moment, Africa's cement makers, and industrialists in other niches, can enjoy a few protections by circumstance.

非洲的水泥生产商和其他领域的工业家此时仍有些环境优势。

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But when he was put to the test by circumstance, he somehow turned catastrophe into opportunity; turned his weakness into strength.

当他被环境左右的时候，他把灾难变成机遇，把弱点变成优势。

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By circumstance and breeding, Mr Foot slipped easily into this world of satire and dissent.

ECONOMIST: Obituary

But if he is a democrat, it would seem to be by circumstance rather than conviction.

ECONOMIST: Latin American leaders

After Mother passed away, he and I came to resemble two flat-sharing bachelors held together by circumstance or obligation.

NEWYORKER: Naima