A bear's hand lacks an opposable thumb, a true digit.

熊的手没有对生拇指，真正的手指。

These opposable thumbs are a trait that humans share with our primate cousins such as chimpanzees.

这些对生拇指是人类与黑猩猩等灵长类近亲的共同特征。

Scientists say without our opposable thumbs, humans might not have survived.

科学家说，如果没有我们对生的拇指， 人类可能无法生存。

Sometimes people talk about the opposable thumb as if it is something that only human beings had.

有时人们谈论可对生拇指，好像它是只有人类才有的东西。

To say that someone doesn't have opposable thumbs might be a form of an insult to someone.

说某人没有对生拇指可能是对某人的一种侮辱。

Among the key features found in primates are hands and feet that can grasp and often have opposable thumbs and toes.

灵长类动物的主要特征之一是可以抓握的手和脚，并且通常有相对的拇指和脚趾。

Their back paws each have one large clawless opposable digit, which allows them to grasp branches with their feet, freeing their hands to forage.

它们的后脚各有一个大而无爪的可对立的指头，这样就可以用脚抓住树枝，腾出手来觅食。

In fact, there are other animals such as apes that have opposable digits; they have something that is like our opposable thumb.

事实上，还有其他动物， 如猿类，它们的手指相对;他们有一些东西就像我们相对的拇指。

The phrase " opposable thumb" distinguishes (makes different) the idea of the human thumb from other animals who don't have this ability.

“opposable thumb”这个短语将人类拇指的概念与其他没有这种能力的动物区分开来。

The scuba-bot’s human-like hands, with its nimble fingers and opposable thumbs, are fantastic tools for the slow, fiddly work involved in taking underwater samples.

潜水机器人的人手， 灵活的手指和相对的拇指，是进行水下采样缓慢而繁琐的工作的绝佳工具。