I'm skeptical that Apple would hire an outside company to build a prototype machine, rather than putting something together in its own well-equipped shop.
苹果有装备精良的车间，如果说它会雇佣外面的公司替自己制造原型机，我对此类说法表示怀疑。
The vernier calipers are measuring tools for the machine shop and inspection department. They are used to measure outside, inside dimensions. Type I calipers are used to measure depth and step.
游标卡尺用于一般机械加工中的测量，可测量内、外尺寸、深度及台阶等。
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