1. A small block of metal or wood with a central, threaded hole that is designed to fit around and secure a bolt or screw. 
   螺母，螺帽中部有螺纹用于与螺栓或螺钉相配合的小块金属或木头
2. Acid causes metal to corrode. 
   酸会腐蚀金属。
3. To sheathe or cover(a metal) with a metal. 
   镀上用一种金属包住或覆盖（另一种金属）
4. catalysis by metal oxides 
   金属氧化物催化作用
5. cold processing of metal 
   冷加工

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