NEMA 4 : Watertight and Dust tight - for indoor/outdoor use with a protection from windblown dust, rain or hose directed wash down environments.是什么意思_NEMA 4 : Watertight and Dust tight - for indoor/outdoor use with a protection from windblown dust, rain or hose directed wash down environments.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句