It has been suggested, therefore, that in traditional usability engineering, features should have to fight to be included, because the vast majority of them are rarely used anyway.

这已经被提出过，所以，在传统的工程可用性领域，功能必须经过斗争才能被包括在内，因为他们中很大一部分很少被用到。

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The eastern cougar is often called the "ghost cat" because it has been so rarely glimpsed in northeastern states in recent decades.

东部美洲狮经常被叫做“鬼猫”，因为近几十年来在美国东北部各州这种动物的影子着实难得一见。

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Mr Clark rarely has to water the garden because it rains so often here!

克拉克先生很少给花园浇水，因为这儿常下雨。

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But Professor Gaechter says his team's theory was that punishment has only low costs because it needs to be used rarely and works as a threat.

VOA: special.2009.03.03

Scientists at Imperial College London examined the force of ball-to-head contact in soccer because it has been rarely studied compared with other types of head contact in the world's most popular sport, such as player head-to-head contact.

WSJ: Soccer 'Header' Impact Likened to Hard Punch

But she noted that ovarian cancer has poor survival rates because it's rarely caught early.

NPR: Retooling Pap Test To Spot More Kinds Of Cancer

On the topic of PowerPoint slides, Kawasaki has a technique that I think is very effective if only because I see it used so rarely and yet it is very personal and makes an immediate connection with an audience.

FORBES: Keys to an Enchanting Presentation