It's extremely rare for it to be this hot in April.

四月份就这样炎热是极其罕见的。

《牛津词典》

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He says young dinosaur fossils are extremely rare, a possible sign that many of them had been eaten by attackers.

VOA: special.2009.09.01

Reports of solar system objects striking each other are extremely rare.

VOA: special.2009.08.25

"And to break records by that sort of margin is something which is extremely rare."

VOA: standard.2009.09.03

One replica showroom houses classic and talked-about models, including the 166MM, an extremely rare car from 1953.

BBC: The ultimate Ferrari festival

Pink diamonds of this size, as regular readers of this blog know, are extremely rare.

FORBES: Connect

It is extremely rare for the bureau to resolve anything, despite the show of accountability.

ECONOMIST: Suppressing dissent