Not only is this harmful to our own health, but it also has a harmful influence on the environment.
还是直接让人类摄取食物比较有效率，亦对人类的健康更有利。
So the need to quickly recognise things that could be helpful or harmful could have had a great influence on rock art and explain why some images are more common across cultures than others.
因此，快速识别事物是有益还是有害的需求可能对摇滚艺术产生了巨大的影响，并解释了为什么一些形象在不同文化中比其他的更常见。
A great deal has been done to protect the children from the harmful influence of bad books.
我们已经做了很多工作，以保证我们的孩子不被这些不健康的书籍影响。
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