- 重点词汇
- 钢板
steel plate; plate; spring of a motorcar; stencil steel board; armour-plating; nickelclad
- 属于
belong to; pertain; appertain; appertain to; reside in; vest in; of; to
- 什么
what; whatever; wot; something; anything; everything; nothing (in negative statements); eh; pardon
- 材料
material; stuff; data; matter; makings; information; medium; handout; raw material; ingredient
- 类别
category; class; type; kind; genre; sort; variety; classification; grouping