He says he ordered the material from China, but then worked with local iron workers to shape the pieces for his drone.

马马杜表示他从中国预定了材料，但然后他又跟本地的钢铁工人一起合作，为无人机的原件塑形。

From the days of Tubal Cain the iron worker had known that heat would accomplish this purification; but heat, up to almost 1865, was an exceedingly expensive commodity.

从 Tubal Cain 的时代起，钢铁工人就知道加热可以完成这种净化；但是直到 1865 年左右，热力还是一种极其昂贵的商品。

For ages iron workers had obtained the finer metal by applying this heat in the form of charcoal, never once realizing that unlimited quantities of another fuel existed on every hand.

多年来，钢铁工人通过以木炭形式施加这种热量来获得更优质的金属，从来没有意识到每只手上都存在无限量的另一种燃料。

For example, Helen Keller was able to recognize a person's work, and in her words, distinguish the carpenter from the iron worker, the artist from the mason or the chemist, by a simple inhale.

例如， 海伦凯勒能够识别一个人的作品，用她的话说，通过简单的吸气， 就能区分木匠和铁匠，艺术家和泥瓦匠或化学家。