The new camera could go much further, helping to detect the presence in fast-flowing blood of very rare cells, like tumor cells, that might be few in number but signify the early stages of a disease.

新技术将能对快速流动的血液中的细胞进行直接拍摄，有助于尽早发现血流中的少量染病细胞，如瘤细胞等。而这些细胞的存在则通常可以表征出人体疾病的早期症状。

youdao

There have been a few notable exceptions, sanctioned by the UN Security Council, but these have been rare and post facto.

有一些特例，联合国安理会制裁了一些行为，不过，这样的例子太少，而且太不及时了。

youdao

'Stalked sea lilies once covered the ocean, shallow and deep, but now are rare,' she said in a written statement. 'I've only seen a few in my career.

“潜伏型的海百合一度覆盖整个海洋，不管是浅水还是深水，不过现在却变得稀有了，”她在一篇文本声明中说道，“我在职业生涯中只见过几回。”

youdao

But that is a terrible mistake because we should know that sculptresses are very rare; very few people have the job of a sculptress or sculptor, so it's a mistake.

但这是严重错误,我们都很清楚,雕刻家是很罕见的职业,只有很少人会是雕刻家,所以这是错的

耶鲁公开课 - 金融市场课程节选

But there are a rare few places where writers can find people like Jonathan Abrams talk about such things like losing control of Friendster, one of the first social networks.

FORBES: Quora: A Technology Writer's Best Friend, For Now

There have been a few studies of heavy usage and rare brain tumors, but these cases are few and far between.

FORBES: Can Cell Phones Really Alter The Way You Think?

Council house tenancies are soon set to be measured not in decades but in years - usually a minimum of five years, but possibly as few as two years in rare cases.

BBC: What future for social housing?