by correspondence

基本解释

Like many here, he is working on a college degree by correspondence course.
像这里的许多人一样，他正在通过函授攻读一个大学学位。
The entire system is matched by correspondence courses for students prevented by illness, disability or residential isolation from attending schools.
为了满足因疾病、伤残、或者居住偏远等缘故无法上学的学生的求学要求，整个制度有一套与正规教育相匹配的函授课程。
Each Contracting Party shall notify the other Contracting Party by correspondence that the legal formalities required for approval of this Agreement have been compiled with.
缔约双方应以信函相互通知已经完成批准本协定的所有必要的法律程序。
www.imprensa.macau.gov.mo

I also want to give another layer to this understanding of O'Connor as a religious writer by looking at what she said in her correspondence to one of her readers who asked her some questions, and this is on the handout that I passed around.
我还想给大家另一层,理解这位宗教作家的方式,那就是去看她,回复一位读者问题的信件，这在我发给大家的材料上有。
耶鲁公开课 - 1945年后的美国小说课程节选

He and Grassley also accused the inspector general of trying to intimidate a whistleblower by going after correspondence between Aguirre and their committee's staff.
FORBES: Congress Takes On SEC
Yet instead of being replaced by public libraries or correspondence schools in the past (as some experts had predicted) or by TED video lectures more recently, college has become more ingrained in our culture than ever.
FORBES: Through Eight Centuries of Criticism, College Remains Worth It