Throughout expiration, the diaphragm passively relaxes and returns to its authentic dome shape. This minimizes the amount from the thoracic cavity. B?m tr?c vít Roto B?m ??nh l??ng tr?c vít B?m hóa ch?t argal b?m hóa ch?t cheonsei B?m hóa ch?t Sandpiper B?m h&oa