初中《生物》第一册 (下 )第四章“线形动物门”中的“图Ⅲ— 18　蛔虫的生活史”(见图 1) ,虽能较清楚地反映出蛔虫一生的几个阶段 (受精卵、感染性虫卵、幼虫、成虫 )及它们在人体中的侵染过程和移行路线 (口腔→咽→食管→胃→十二指肠→肠壁血管→肝→心脏→肺→支气管→气 The “life history of locusts” (Figure III) in the fourth chapter of “biology” (bottom) of junior high school (bottom), “Figure 1”, can clearly reflect several stages of locust life ( Fertilized eggs, infective eggs, larvae, adults) and their infection processes and migration routes in the human body (oral → pharynx → esophagus → stomach → duodenum → intestinal wall blood vessels → liver → heart → lung → bronchi → gas