“外罩”用英语怎么说

钟放在椭圆形的大理石基座上，外罩玻璃罩。The clock stands on an oval marble base, enclosed by a glass dome.座椅的外罩是聚氯乙烯 ( 做 ) 的.The seat covers were ( made of ) PVC.产品外外罩颜色可根据客户需求另定.Cover color can be according to the customer required....