He also had one volcano that was extinct. But, as he said, “One never knows!” So he cleaned out the extinct volcano, too. If they are well cleaned out, volcanoes burn slowly and steadily, without any eruptions. Volcanic eruptions are like fires in a chimney. On our earth we are obviously much too small to clean out our volcanoes. That is why they bring no end of trouble upon us.
〖精读笔记〗
extinct [ɪkˈstɪŋkt] adj.熄灭的；死的(火山)
burn [bɜːn] vt.燃烧
slowly [ˈsləʊli] adv.缓慢地，慢慢地
steadily [ˈstedəli] adv.稳定地；稳固地
volcanic [vɒlˈkænɪk] adj.火山的
chimney [ˈtʃɪmni] n.烟囱
obviously [ˈɒbviəsli] adv.明显地
that is why这就是为什么，这是...的原因
