Itchy skin has many causes, including dryness and allergies, but only rarely does it signal that a person has cancer.

皮肤瘙痒存在许多诱因，其中包括皮肤干燥和皮肤过敏，但是把皮肤瘙痒作为癌症的一个体征是很少见的。

youdao

But it was rarely used, most often being granted only as a special favour to friends by those in power.

但当时很少使用，仅仅作为一种对朋友的特殊优惠。

youdao

Big anniversaries come and go, but moments like this arise only rarely.

大型年度庆典来来往往，但像这样的时刻很出现。

youdao

The author, who published only the one novel, is still alive but rarely speaks publicly.

VOA: special.2010.07.08

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

But only rarely across the odd word or line does it approach the conciseness or memorableness of poetry.

ECONOMIST: Modern poetry can be plaintive or richly idiomatic, or both

Such clarity has been in place since 2003, but only rarely in much of the modern era.

FORBES: Dear Congress, When You Jump Off the Cliff, Remember to Save the Dividend

In debates, Paul took shots at Rick Santorum and Newt Gingrich, but only rarely and softly did he punch at Romney.

FORBES: Paul Achieving Goals Even If He Won't Be Nominee