一个头，八只眼睛，八条腿。

One head, eight eyes, eight legs.

所有的蛛形纲动物都有八条腿。

All arachnids have eight legs.

它有八条腿，专为在岩石地面上行走和攀爬而设计。

It has eight legs which have been built for walking and climbing over rocky ground.

这只蜘蛛是一种有八条腿的生物。

The spider is an eight-legged creature.

蜘蛛有八条腿。

A spider has eight legs.

蜘蛛可是有八条腿的呢！

But spider has eight legs!

她的八条腿帮着忙，忙个没完。

Her eight legs were very busy helping.

它这样工作，八条腿帮了大忙。

As she worked, her eight legs were a great help to her.

八条腿，它正在向威尔伯挥动其中一条腿，友好地打着招呼呢。

She had eight legs, and she was waving one of them at Wilbur in friendly greeting.

但更为重要的是，科学家已经量化了这个八条腿的动物在全球生态系统中起了多大作用。

But in more serious terms, this matters because scientists have quantified how big of a role the eight-legged critters play in the global ecosystem.