Ospreys specialise in catching slippery fish. Unlike other birds-of-prey, they have four powerful toes of about equal length, while the outer one is reversible and can swivel backwards or forwards.

通过对以光滑鱼为猎食的鱼鹰进行研究发现，它不象其它的食肉鸟类，它有四只同样长而非常有力的爪，并且最外边的一只是可以钩回和前后旋转。

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Unlike their powerful parents, newborns are tiny—weighing four pounds (two kilograms)—and able only to cling to their mothers' fur.

新生儿是十分脆弱的。 他们不像自己强大的父母，体重只有4磅（两公斤），只能勉强抓住母亲的毛皮。

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With all four engines at full power, HB-SIA is only as powerful as a motor scooter.

所有的引擎全功率运转时其力量也只有一个脚踏车那么大小。

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Bentley has released photos of its most powerful four-door model yet, the 2014 Flying Spur.

FORBES: World Debut: Bentley Remakes The Flying Spur

At the trade show, Samsung's president of mobile chips, Stephen Woo, revealed a new design for cellphone processors that has eight processing cores, four powerful ones and four that are less powerful for simpler tasks.

WSJ: IPhone-Like Hype Builds for Samsung Galaxy S IV

As the opera opens, Elektra's father, King Agamemnon, is already dead, and the score begins with a powerful, four note theme to which Elektra later sings his name.

NPR: Unparalleled Dysfunction: Strauss' 'Elektra'