To minimize the risk of back injury or falling down or dropping a tank on a foot, you should be able to put on the scuba unit from a sitting position.是什么意思_To minimize the risk of back injury or falling down or dropping a tank on a foot, you should be able to put on the scuba unit from a sitting position.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句