问答题

中国4,000年前就已经出现了用于针灸(acupuncture)的针，最初的针是石做的，后来发展到铜针、金针或者银针，今天用于针灸的针一般都是钢做的。针灸的发展是响应了一个理论——人体里有很多特殊的穴位(meridian point)把内部器官联通起来并且血气在经脉里流动。根据这个理论，血气的流动被打断的时候就产生了疾病，于是把针捅进皮肤底下并且旋转就可以打通经脉，恢复血气的正常流通。

【参考答案】

Acupuncture needles dating from D,000 years ago have been fo......

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