Plastic's raw material, process acid medicament and plastic process machine are plastic industry's three biggest essential elements.
塑料原材料、加工助剂和塑料加工机械是构成塑料产业的三大基本要素。
2
This process is termed "replacement" because solutions have dissolved the original material and replaced it with an equal volume of the new substance.
这个过程被称为“置换”，因为溶液溶解了原来的物质，并用等量的新物质取而代之。
3
In the process of formation, the material must have received an environmental signal that reflects a change in climate and that can be deciphered by modern physical or chemical means.