Adult: Place heel of hands, one atop the other, on lower third of the sternum. Lock elbows and maintain shoulders in line with sternum.是什么意思_Adult: Place heel of hands, one atop the other, on lower third of the sternum. Lock elbows and maintain shoulders in line with sternum.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句