Ancient spiders have been known to have a certain kind of organ to make their silky threads.
古代的蜘蛛据了解已经具有了某种可以制造蛛丝的器官。
The discovery supports a hypothesis that ancient spiders first evolved to produce silk from their feet before changing to the modern configuration of producing it in their abdomens.
这个发现提供了一个假说，蜘蛛的祖先可能是用脚吐丝，只是到了现代才改为由腹部吐丝的。
Spiders are ancient animals with a history going back many millions of years.
蜘蛛是古老的动物，其历史可以追溯到百万年前。
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