leading surface meaning in Chinese

前沿面
先导工作面

Industries with particularly high potential exposures include : construction work involving welding , cutting , brazing or polishing on lead surfaces and application of lead solder ; most smelter operations either as a trace contaminant or as a major product ; secondary lead smelters where lead is recovered from batteries ; and firing ranges
有机会接触铅的工作包括：在建筑业中，在含铅的表面上进行焊接切割镀焊或打磨粉饰以及使用铅锡作焊接在采矿业中，提炼铅或其他元素的工种在回收业中，把电池中的铅再循环利用以及弹药制造工作。