petition          
 noun [ C ] uk/pəˈtɪʃ.ən/ us/pəˈtɪʃ.ən/
 请愿书
a document signed by a large number of people demanding or asking for some action from the government or another authority
  I signed a petition against the proposed closure of the local hospital today. 今天我在反对关闭当地医院的请愿书上签了名。 
  law specialized(向法院递交的)上诉书,诉状 
a formal letter to a law court asking for a particular legal action
  She's filing a petition for divorce. 她将要递交离婚诉状。 
 petition       
verb [ I or T ] uk/pəˈtɪʃ.ən/ us/pəˈtɪʃ.ən/
 law also specialized(向法院)递交上诉书,上诉 
to make a formal request for something, especially in a law court
  They're petitioning for/about better facilities for disabled people. 他们正在请愿,希望当局能为残疾人安装更好的设施。 
 [ + obj + to infinitive ] I think we should petition the government to increase the grant for the project. 我认为我们应该请求政府增加对该项目的拨款。 
 She is petitioning for a re-trial. 她将上诉要求重审。