词汇	二氧
释义	二氧 Èr Yǎngdioxygen
随便看	up-down traverse of the arm updown turning of the arm up down turning of the arm up-down turning of the arm up & down wind-bar up-down wind direction board updraft up draft up-draft updraft and downdraft Up-draft barn updraft boiler up-draft boiler updraft carbureter updraft carburetor up-draft carburetor updraft carburetter updraft carburettor updraft carburettor combustion engine up draft combustion up-draft combustion up draft filn updraft furnace up-draft furnace updraft furnace heater