Proper placement of the axillary roll is under the thorax caudad to the axilla. 腋窝卷的正确使用方法，是放在腋窝的尾端的胸廓下。
The cardio-thoracic ratio, expressed as a percentage, is the ratio between the maximum transverse diameter of the heart and the maximum width of the thorax. 心胸比率用百分率表示，是心脏最大横径和胸廓最大宽径的比率。
