"Imagine all the joints that are in your hand. There's 20 motions around all those joints," says Pittsburgh neurobiologist Andrew Schwartz.

匹兹堡的神经生物学家安德鲁·施瓦茨说：“想象一下，你的手上所有的关节，这些关节可以完成20种动作。”

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Thus, while using this mouse hand of man will be in a really comfortable position that will help to avoid unnecessary effort and tension in the joints during manipulation.

因此，使用这种鼠标的人，手得到一个非常舒适的位置，可避免操作中手关节上不必要的紧张。

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But those recordings can’t tell the computer anything useful about joints and limbs on their own, so programmers dive into the raw data and hand-code it to label each body part (at each frame!).

但没有告诉计算机有效的信息，比如哪里是关节，哪里是四肢等。 程序员需深入分解原始数据，为身体各部分，进行人工编码。

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Clambering from floor to floor on slender bridges of bamboo, shirtless workers set wooden roof joints by hand.

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Think of a mechanical hand where the knuckle joints and the actuators for those joints are integrated right in the joints themselves.

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They hand-cut mortise and tenon joints (square-cut slats glued into matching holes).

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