尘肺的纤维化形成是一个缓慢发展的病理过程。决定其转归有两个重要因素。①致病因素的质与量;②病变发展过程与速度。在相同质量粉尘的条件下,它对人体产生的危害,不仅在病变程度上表现有所不同,而且在进展速度上差别亦圾大,两者是互为影响的。国内外在进行尘肺流行病学调查和临床观察中,多以病变 Pulmonary fibrosis is a slowly developing pathological process. There are two important factors that determine its outcome. ① quality and quantity of disease-causing factors; ② disease development and speed. Under the condition of the same quality of dust, its harm to the human body not only shows a different degree of lesion but also shows a big difference in the speed of progress, both of which influence each other. Pneumoconiosis at home and abroad in the epidemiological investigation and clinical observation, and more lesions