误Iron and steel industry are developing.
正Iron and steel industry is developing.
钢和铁的产量都在增长。误Iron and steel outputs is increasing.
正Iron and steel outputs are increasing.
析iron and steel作为一个固定短语“钢铁”,不管是作复合名词还是作形容词,动词都要用单数; 但如果把iron和steel作为两个不同的内涵,就要求用复数动词。
误She ironed the wrinkles in her dress.
正She ironed out the wrinkles in her dress.
析动词iron指“熨烫衣物”,后接表示衣物、服装类的名词作宾语。但要表示“借熨烫把褶皱除去”,应该用iron out。