英汉对照：大拇指到底是不是手指啊？
Is a thumb a finger?
大拇指是手指吗？
大家可以选择一边听小编的朗读，一边阅读文章内容：
The OxfordDictionaries.com definition for finger is as follows: ‘each of the four slender jointed parts attached to either hand (or five, if the thumb is included)’. This wording implies that, while the thumb isn’t typically regarded as a finger, there is enough evidence of this use to include it in the definition. Although thumbs have certain similarities to fingers, there are some key differences. It’s therefore more accurate to describe a thumb as one of five digits that we have on each hand, rather than as a finger.
牛津英语在线词典对于finger一词的释义是这样的：each of the four slender jointed parts attached to either hand (or five, if the thumb is included)（与每只手相连的四个纤细的连接部分——也可以说是五个连接部分，如果大拇指也算的话）。从这个释义中，我们可以推断出：尽管大拇指不是典型意义上的手指，但从定义上看，其功能与四个手指基本相同。但是，尽管大拇指与手指存在某些相似点，它们之间仍然存有一些重要的不同点。因此，如果要给大拇指下定义的话，最好不要说它也是手指，而是把它描述为每只手的五个指关节之一。
‘Digit’ is the technical term which covers fingers, thumbs, and toes in humans, and similar appendages in some animals. The thumb is the short, thick first digit of the human hand. The other four digits are our fingers.
指关节是个术语，包括人类的手指、大拇指和脚趾，以及一些动物身上的类似附肢。大拇指是人类手掌上的短而厚的第一个指关节，而另外四个就是我们的手指。
What are the similarities and distinctions between the thumb and the four fingers? Some are obvious: all five digits on our hands are jointed and have nails on one surface of the uppermost joint, and a unique pattern of fingerprints (or thumbprints) on the other surface of that joint. However, the thumb only consists of one joint and two phalanges, whereas the other four digits have two joints and three phalanges. The thumb is set lower on the hand and apart from the fingers. The thumbs of humans and other primates (such as chimpanzees) are opposable: we can move our thumb to face and touch the other digits of the same hand, which enables us to carry out a wide range of manual actions that animals with non-opposable digits are unable to perform.
大拇指和四个手指之间到底存在哪些相似处和不同点？有一些是显而易见的：所有五个指关节都是与手掌相连的，每个指关节的最顶端都有指甲覆盖，而且每个指关节都有各自独特的指纹或拇指纹。然而，大拇指只有一个关节和两根指骨，而其他四个指关节（即手指）都有两个关节，而且每个关节都有三根指骨。大拇指在手掌中所处位置较低，而且与手指是相对分开的。人类和其他猿类动物（如黑猩猩）的大拇指是与手指相对的，这就使得我们可以移动大拇指，使其可以与同一手掌的手指面对面，并且相互接触。而这就使得我们得以完成很多不同的手工任务，而这是指关节不对立的动物无法做到的。