What collective means in theory is rather woolly;

集体在理论本来就是比较模糊的概念；

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Researchers have found evidence to suggest that climate change, rather than humans, was the main factor that drove the woolly mammoth to extinction.

研究人员发现导致猛犸象灭绝的证据，不是人类活动，而是气。

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Yarn bombing, also known as guerrilla knitting, is a type of street art using knitted yarn rather than paint, such as the dressing of statues in woolly hats and scarves or hanging pompoms in trees.

BBC: placard-making