metal / gold / silver / copper / iron / calcium /  …………

steel / still / steal / steer
有很多钢铁（steel），仍然（still）要偷（steal）是为什么呢？难道有人操纵（steer ）你们吗？
steep /  …………

stainless steel 不锈钢
iron and steel 钢铁
steel industry 钢铁工业
steel pipe 钢管
steel wire 钢丝
alloy steel 合金钢
steel production 钢铁生产
steel bar 钢筋
steel plant 钢铁厂
cast steel 铸钢
How the Steel was Tempered <钢铁是怎样炼成的>前苏联作家尼古拉·奥斯特洛夫斯基所著的一部长篇小说
steel for 为...（多指不好的事）做思想准备
steel oneself 磨练；磨砺 坚强
steel oneself to do sth. 下定决心做某事
man of steel 钢铁之躯
stainless steel 不锈钢
steel oneself 使自己坚强
steel cable 钢索
It takes a good blacksmith to make good steel. 制造好钢需要一个好铁匠
steel mill 轧钢厂
magnetic steel 磁性钢
steel girder bridge 钢梁桥
steel and wood 钢和木材
steel oneself against sth. 坚强地抵抗
malleable steel 可锻钢
weld steel 焊接用钢
reinforced by wood and steel 用木材和钢加固
iron and steel industry 钢铁工业
steel magnate 钢铁大王
steel and glass 钢和玻璃
have a mind like a steel trap 有一个钢铁陷阱般的头脑
steel wool 钢丝棉