今天，她注意到，敲击燧石时，桑德·加特突然向前弯转他的右手腕。
Today, she notices that Sandgathe snaps his right wrist forward when he strikes the flint.
威廉姆斯通过拍摄数百小时的燧石敲击，对桑德加特的动作进行电脑分析，把他的直觉翻译成科学。
Williams translates Sandgathe's intuition into science by filming hundreds of hours of knapping and analyzing the knapper's movements on a computer.
桑德加特坐在一间无窗户的实验室里的一张椅子上，他的左手握着一块墨黑的大燧石。
He sits on a chair in a windowless laboratory and cradles a large rock, or core, of jet-black flint in his left hand.
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