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。
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。
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。
We want to buy Ferroalloy and Products, Coal, New Materials, Metals, Copper Products, Scrap.
我们要采购铁合金及产品，煤炭，新材料，金属，铜产品，废料。
We want to buy Ferroalloy and Products, Coal, New Materials, Metals, Copper Products, Scrap.
我们要采购铁合金及产品，煤炭，新材料，金属，铜产品，废料。
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