◊ This abbreviation is used in addresses when you are sending a letter or package to a person by using someone else's address or the address of a company.通过其他人或公司的地址给某人寄信或发包裹时，在地址中使用这一缩略词。
The letter was addressed to “John Smith c/o Merriam-Webster, Inc.”这封信上写着“由梅里亚姆-韦伯斯特公司转交约翰·史密斯”。