词汇	周期密度
释义	周期密度 periodic density
随便看	water tight compartment water-tight compartment watertight compartmentation watertight concrete water tight concrete water-tight concrete watertight connector watertight construction watertight construction joint watertight container watertight containers for use while SWIMMING watertight core watertight cover water tight cover watertight curtain watertight deck water tight deck watertight design watertight diaphragm watertight diaphragm assembly watertight division watertight door water tight door watertight doors watertight door test