“保护物”用英语怎么说？

围裙是做脏活时的保护物.An apron is a protection when doing dirty work.各种维生素都是保护物,能对抗某些养素缺乏症.Vitamins are protectives against certain deficiency disease.钢铁制品常常涂上一层保护物,以免生锈.Steel and iron products are often coated lest they should ru...