Duff soon mastered the skills of radio produc-tion.达夫很快掌握了广播节目制作的技能。His genius alone has mastered every crisis.仅凭天分，他就控制了所有的危机。I've completely mastered the use of all the words I've learned.学过的词汇我全部掌握了....
It's not difficult to understand this world when you mastered the internal relations of things.掌握了事物的内部联系你就不难理解这个世界。When you have mastered one situation you have to go on to the next...一旦控制住了一个局面，又得接着应付下一个。I've...
The practice of smelting ferromanganese silicon with slag of high carbon ferrochrome is introduced.介绍了用高碳铬铁渣做造渣剂冶炼锰硅合金的生产实践.Guimeng , electric, chromium manganese, ferro - alloys such as ferromanganese products.硅锰 、 硅铁 、...