常見例句雙語例句Once the human becomes addicted after smoking is very then difficult to swear off, because in tobacco's Nicotine widely regards as narcotics, it plays the stimulation to the central nervous system.人一旦對吸菸上癮後便很難戒掉，因爲菸草中的尼古丁被廣泛眡爲毒品，它對中樞神經系統(tǒng)起刺激作用。blog.sina.com.cn 返回 swear off tobacco