These crystals are then embedded in a plastic, and the plastic is extruded as a wire.然后将这些晶体嵌入一块塑料,再把塑料挤压成线。The casings of desktop computers are basically made by the extrusion of aluminums.桌上型电脑的机壳基本上是用铝挤压成型的方式做成的。As the hot metal passed between the huge rollers it was pressed into thin sheets.炽热的金属块从巨大的轧辊中穿过,马上被挤压成薄薄的金属片。