1. a substance as germanium or silicon whose electrical conductivity is intermediate between that of a metal and an insulator; it increases with temperature and in the presence of impurities. 
   锗或硅等导电性介于导体与绝缘体之间的物质，其导电性随温度升高或杂质的出现而提高。
2. catalysis by metal oxides 
   金属氧化物催化作用
3. cold processing of metal 
   冷加工
4. desulphorization of hot metal 
   铁水炉外脱硫
5. friction of metal working 
   塑性加工过程的摩擦

查看更多例句 相关情景会话