1. A chemical solution, such as an acid, that is used as a bath to remove scale and oxides from the surface of metals before plating or finishing. 
   淡酸水，稀酸液在金属电镀或精加工之前用来除去金属表面铁锈和氧化物的化学溶液，如酸溶液
2. A conductor termination in a switch or relay a metal element(usually of special alloy or plating) through which current flows when the device is closed and which separates from another contact to open the circuit. 
   开关或继电器的导体端部；（通常是合金或镀金的）一个金属片，当装置接通时电流流经它，当它同另一个触点分离时则切断电路。参阅relay。

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