Oxidation - reduction reactions are important in the solubilization and precipitation of iron and manganese.氧化还原反应在铁和锰的增溶和沉淀中具有重要作用.The contents of organic material, limonite and manganese hydroxides influence the variat...
...the British aero-engine maker, Rolls-Royce.英国飞机引擎制造商，罗尔斯-罗伊斯This is the Rolls-Royce of canoes.这是独木舟中的极品。He drove a Rolls-Royce with a personalised number plate.他开一辆个性车牌的劳斯莱斯。Royce Hall was an exact replica of the basi...
She arrives every day at eight, as regular as clockwork.她每天八点钟到, 极有规律After the clockwork of the watch was cleaned the watch kept perfect time.那块表的发条装置擦干净后,走起来就非常精确了.She used to come here every Saturday evening as regular...