... Eg: he proved that he was right and his critics had to back down. 他证明了他是正确的，而那些非难他的人不得不屈服。 Back out of sth 不履行（协议、承诺等） Back sb/sth up 支持或鼓励某人 ...
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Lice date back to ancient times, and they have lived as parasites on our bodies and scalps ever since.
虱子可以追溯到远古时代，他们生活的寄生虫，在我们的机构和头皮至今。
In the same way, species of lice on living animals and birds reflect the splits in animal and bird ancestry back to the time that lice first arose.
通过分析动物以及鸟类身上的虱子，同样能够折射出鸟兽的进化历程。
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