These are combined in a chemical reaction to create ethylene dichloride, which is turned into a gas, and then, through a process called " polymerization" , it becomes a fine, white powder called polyvinyl chloride, or PVC.

们在化学反应中结合，生二氯乙烯，气体，然后，通过一个叫做“聚合”的过，一种白色的细粉末，叫做聚氯乙烯，简称PVC。