Ch? ??ng trong vi?c n?m b?t th? tr??ng, luôn c? g?ng ti?p thu nh?ng cái m?i và mang ??n cho khách hàng nh?ng s?n ph?m t?t nh?t.The diaphragm is usually a barrier involving the thoracic and abdominal cavities, avoiding abdominal organs from protruding to the chest cavity. It performs an important purpose in sustaining intra-abdominal tension by