It's extremely cruel to perform an experiment on live animals.

对动物活体进行实验是一件极其残忍的事情。

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One of the most famous legends it that of Nian , an extremely cruel and ferocious beast, which the Chinese believe, eats people on New Year's Eve.

其中一个最有名的传说就是人们相信有一种叫做“年”的非常残忍、凶恶的野兽，会在春节前的晚上出来吃人。

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Unfortunately, they failed to acknowledge the cruel reality that the __ 07 __ of entering the professional ranks are extremely small.

不幸地，他们没能认清残酷的现实，因进入职篮的可能性微乎其微。

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My vow must have seemed to you extremely cruel, or insane.

NEWYORKER: History of a Disturbance

"It depends on who comments are being levelled at - to a class of children, where there will be a distribution of body sizes, it is important to know being overweight can lead to diabetes, but it is more of a psychological issue than a health issue - and children can be extremely cruel, " he says.

BBC: Should we stop calling people 'overweight'?