候车室的公告牌要求人们不要吸烟和随地吐痰。Notices in the waiting room requested that you neither smoke nor spit.随地吐痰招致疾病的传播.Spitting in the street leads to the communication of disease.吐痰是不好的行为.It's bad to spit....

“吐痰”的英语可以翻译为：expectorate，spit，expectoration ...