巨噬细胞吞噬异物，如肺内的尘埃及碳粒，同样还有活体染料的微粒。
Macrophages phagocytize foreign materials such as dust and carbon particles in the lung, as well as vital dye particles.
游离二氧化硅致肺组织纤维化机制十分复杂，涉及多种细胞及生物活性物质参与的炎症反应、免疫反应、异物反应、细胞毒作用等。
The mechanism of fibrosis caused by free silica particles involves a lot of cells and reactions including inflammatory reaction, immunological reaction, foreign body reaction and cell toxic action.
结果患儿均显示异物的直接征象，CT显示异物位于右肺主支气管12例，右中间支气管1例，右下叶支气管2例，左肺主支气管6例。
CT scan showed foreign body was located in right main bronchial 12 cases, right middle bronchial 1 case, right inferior lobar bronchial 2 cases and left main bronchial 6 cases.
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