焊接: weld; welding; soldering; seal; sealing; sealing-in; shutting together 短语和例子电弧焊接 (electric) arc welding; 焊接材料 welding material; 焊接操作 welding operation; 焊接车间 welding shop; 焊接点 point of weld
沟: 名词1.(挖掘的水道或工事) channel; ditch; gutter; trench 短语和例子交通沟 communication trench; 排水沟 drainage ditch; drain; 阴沟 drain; sewer; 挖一道沟 dig a ditch; 沟里的水不很清洁。 the water in the ditch is not very clea
