Typically, donkeys are used as work animals.

驴子是很典型的劳役动物。

There were too few plants for their work animals to eat.

他们的工作动物可吃的植物太少了。

They include pets, like cats and dogs, working animals and farm animals, like cows and sheep.

它们包括如猫和狗这样的宠物，还有如牛和羊这样的役用动物和农场动物。

Extraordinarily intricate scans of dinosaur skulls have allowed scientists to study in intricate detail how animals' senses worked.

科学家们对恐龙头骨进行了极其复杂的扫描，从而能够详细研究动物的感官是如何工作的。

Mules are known as work animals because of their ability to carry a lot of weight over long distances.

骡子被称为役用动物，因为它们有长距离搬运大量重物的能力。

It was a travelling show of animals and people working under a large tent, later known as the Big Top.

主要是一些动物和工作人员在一个大的帐篷，也就是后来的马戏篷(Big Top)里旅游演出。

" A dragon is a working animal, " said Stoick the Vast.

" 龙是一种工作的动物，" 浩瀚的斯托伊克说。

Before the movies and the television show, a lot of people saw dogs as sort of working farm animals.

在电影和电视节目出现之前，很多人将狗视为一种工作的农场动物。

This was an important business before the days of tractors, when many families made a living from farming and mules were used as work animals.

在没有拖拉机的年代，那时大部分家庭还是用牲口来耕地，这是一个很重要产业。

Even if real animals don't completely disappear like Thayer's painted birds, counter shading could still make them harder to detect because many animals visual systems work by zeroing in on contrast, the difference between light and dark in a scene.

即使真正的动物不会像塞耶画的鸟一样完全消失，反阴影仍然会使它们更难被发现，因为许多动物的视觉系统是通过聚焦对比度来工作的，对比度是场景中明暗的区别。