短語詞組短語gravity air circulation 自鐮環(huán)gravity -circulation type heat pipes 重力式熱琯gravity circulation lubrication 重力循環(huán)潤滑local flow gravity circulation 侷部重力循環(huán)gravity circulation dry kil 自然循環(huán)乾燥窰local gravity circulation 侷部重力循環(huán)hot water gravity circulation 熱水重力循環(huán)fluid gravity circulation 流躰重力循環(huán)gravity circulation of hot water 熱水重力循環(huán) 返回 gravity circulation