一只名叫贝蒂的新喀里多尼亚乌鸦把一根笔直的铁丝咬成一个弯钩，用它把一小桶她最喜欢吃的食物从一根垂直的管子里吊了出来。

One New Caledonian crow, called Betty, bent some straight wire into a hook and used it to lift a small bucket of her favourite food from a vertical pipe.

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这说明这个开门的人用的不是弯钩，而是一把钥匙。

This indicated that the man before whom that door had just opened had not a hook but a key.

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文章研究分析了梳棉机的均匀混合作用和纤维弯钩问题。

The uniform mixing action and hooked fiber hook problem of a carding machine are discussed.

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People have referred to this as a J shaped curve with this little up tick in the left hand side and people--some people have sort of said, well maybe it's not so bad to be overweight because it's not so good to be underweight as well and that's a problem.

人们把这称为J形曲线,最左边有一个向上的弯钩,因此就有人说,也许超重也不一定就是一件坏事,因为体重过轻也不是什么好事,这是个问题

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选