Do v?y, quy?t ??nh ch?n màng b?m ???c làm b?ng ch?t li?u gì c?ng r?t quan tr?ng.The diaphragm is a vital muscle mass that separates the chest cavity through the abdominal cavity and plays a critical role in respiratory. After you inhale, the diaphragm contracts and flattens, letting your lungs to increase.The sternal portion lowers the costal ca