The optimal height of the handgrip of a walker was found to be at the level of the wrist crease when the upper extremity hung down.是什么意思_The optimal height of the handgrip of a walker was found to be at the level of the wrist crease when the upper extremity hung down.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句