Diamond grinding wheel is the development of the early seventies and applications, mainly for non-ferrous metals materials processing.

金刚石砂轮是七十年代初开始研制和应用的，主要用于非铁族金属材料的加工。

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We must imagine the early Earth as a mixture of rocky materials, metals, and trapped gases, subject to constant bombardment by smaller planetesimals and without much of an atmosphere.

我们必须想象早期的地球是岩石材料、金属和封闭气的混合物，受到较小的星子的持续轰击，没有多少大气。

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The process is possible only with certain materials (plastics, resins and metals) and with a precision of around a tenth of a millimeter.

这个过程只能用特定的材料（塑料，树脂和金属），精度在0.1毫米左右。

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So, if we're going to go to the moon, we're going to go to Mars,we want to be able to produce oxygen, structural metals and photovoltaic materials from in situ resources.

如果我们要去月球上，我们要去火星上，我们则必须要制造,氧气，结构金属和光电材料,就在原地制造。

麻省理工公开课 - 固态化学导论课程节选

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Like the 1970s, Tillman sees this decade as one in which financial assets become less valuable than hard assets such as real estate, metals, raw materials and even collectibles.

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Input prices continued to rise, particularly for fuel, other petroleum-based materials, metals, food, and chemicals.

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