n.通风面具
Pneumatophore (aerophore; breathing root) A specialized negatively geotropic root produced by certain aquatic vascular plants(especially trees such as mangroves , e.g. 呼吸根：指由某种水生维管植物产生的特化的负向地性根（尤其如红树，如海桑属），在土壤之上生长良好。
aerophor 手提式呼吸器
