translation.en: And not only that -- he would sometimes pick a leafy twig and strip the leaves -- modifying an object to make it suitable for a specific purpose -- the beginning of tool-making.
translation.zh: 不仅如此，他还会捡一根树枝， 把叶子捋净。 修整物体以适于某种特殊用途， ——这就是制造工具的开始。