“保护物”造句

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 rust.