The fossils are the oldest-known evidence of the false thumb, which is really an enlarged wrist bone called the radial sesamoid.

这些化石是目前已知拇指最古老证据，拇指实际上是一块叫做桡侧籽骨增大腕骨。

The wrist bones of Acanthostega weren't arranged in a formation that would've made walking a very easy motion.

Acanthostega 腕骨并没有排列成使行走变得非常容易形状。

Also, the carpals in their wrists were elongate and made a greater contribution to the length of the wing.

此外，它们手腕处腕骨伸长，对翅长度贡献更大。

Those pterosaurs typically had shorter tails, longer wrist bones, big crests, and either simple teeth or no teeth at all.

这些翼龙通常有较短尾巴、较长腕骨、较大嵴以及简单牙齿或根本没有牙齿。

All these motions use gliding, or plane joints, like the one between the distal ends of your radius and ulna, and the carpal bones of your wrist.

所有这些运动都使用滑动或平面，比如桡骨远端和尺骨之间，还有手腕腕骨。

It's flexible, with an enlarged wrist bone which allows it to grasp and manoeuvre the bamboo with a dexterity and precision that a monkey would be proud of.

它灵活且腕骨较大，所以它们能以连猴子都会自豪灵敏度和精准度来抓紧和操纵竹子。

Their texture is spongy except at the surface, where there is a thin layer of compact bone. Examples of short bones are the wrist and ankle bones.

它们结构除表面为一层菲薄密质骨外，其余部分如海绵般疏松多孔。短骨实例包括腕骨和踝骨。

It's important to have your proportions in balance, he says and advocates making sure your sleeves are the right length – roughly halfway between your wrist bone and the bone at the bottom of your hand.

他说，让你比例保持平衡很重要，并提倡确保你袖子长度合适——大约在你腕骨和手底骨头之间一半。