pay off ,pay back ,pay up 的用法差别?
pay off= 偿清(债务等);发清(工钱);付清. He took it upon himself to pay off the debt. 他自愿负责还清债务. pay back= 偿还;还钱; I rely on her to pay back the money. 我相信她会还钱. pay up=(全部或按时)付清;缴清(股款等); Applicants are required to pay up the required course fee before course commencement date. 申请者必须在开课前缴付学费. 有用请采纳