voucher; proof; evidence; certificate
seat reservation voucher
订座凭证
audited voucher
核讫凭证
receiving voucher
收款凭证
tax payment receipt
完税凭证
cash receipt voucher
现金收入凭证
evidence voucher
已付款凭证
business voucher
业务凭证
original evidence
原始凭证
evidence for keeping account
记账凭证