Acid rain and polluted air also damage the bricks and stonework of buildings, and corrode the metalwork of steel bridges and railings. 酸雨和被污染的大气还会侵蚀建筑物的砖块和石造的部分，腐蚀钢制桥梁和铁轨的金属部分。
Here we are in the yard of the steel mill. 这儿就是不锈钢厂的料场。
With this discovery, stainless steel was born. 因这一发现，不锈钢问世了。
