TCMthe written abbreviation of care of, used especially in addresses when you are sending a letter or package to someone who is living in someone else’s house/care of的书面缩写,由…转交〔书信用语〕
John Hammond, c/o Mrs Pearce, The Old Rectory, Reepham
里弗姆老教区酒店,皮尔斯夫人转交约翰•哈蒙德
From Longman Business Dictionary
c/oc/o
written abbreviation for CARE OF, used when you are sending something to someone who is living in someone else’s house or receiving mail at their place of work
John Hammond, c/o Dowling Music College, Bethesda, Maryland, Virginia