物理化学因子 meaning in Chinese

physical chemical factor
physical-chemical factor

After asthma patients ' respiratory tract suffering the allergy sources or other physical - chemical factors stimulation , they will create overactive reaction to cause the spasm of respiratory tract ' s smooth muscle , membrane oedema , mucus over secrete which narrow the respiratory tract and cause the asthma syndrome like coughing , breathe heavily and breathing difficulty
气喘患者的呼吸道在受到过敏原或其他的物理化学因子刺激后，产生过度激烈的反应，使呼吸道的平滑肌发生痉孪，粘膜水肿，粘液分泌过多，致呼吸道管径变小，而产生咳嗽，喘呜，呼吸困难的气喘症状。