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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Substrates: electric materials; metals; various kinds of fabrics and other kinds of materials. It has special bond effect in all cotton and other heat sensitivity fabric materials.

适用基材：电子材料，金属，各种纺织品等，对全棉，毛麻等热敏性面料有特殊的粘合效果。

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We tend to think that societies choose materials-metals, ceramics, fibers - according to their physical qualities such as mechanical performance, under a given set of conditions of use.

我们倾向于认为人们选择金属材料、陶瓷材料、纤维材料是根据它们在特定用途的条件下的物理性质，如机械性表现。

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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

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

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But as the year goes on, he thinks more economically sensitive sectors, such as materials (metals, chemicals, paper companies) and technology stocks, will strengthen.

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After all, they are making billions of dollars in selling raw materials and precious metals to the West.

FORBES: Fact and Comment