have records that can be referred to;be a matter of record;be documented;be on record [file] ;

Also, every letter communication has a record and can be kept for further reference when needed.
再者, 每一份信件往来日后一旦需要,都有案可查.
来源:互联网摘选Four men, dim in history, but their names still on record, make up the visiting party.
四个人组成了这个访问团, 他们在历史中虽然默默无闻, 他们的姓名却还是有案可查的.
来源:词典精选例句
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