凭记性 by heart
凭记忆 from memory ; by heart ; memorization
单凭记忆讲 speak from memory
牢记凭记忆 by heart
凭记忆说话 talk without book
记账凭证 voucher ; posting document ; bookkeeping voucher ; Account credentials
复式记账凭证 mvltiple account titles voucher ; mvltiple account titles ; haha multiple account titles voucher
凭证记录 [会计] Evidence record
记账凭证核算形式 Bookkeeping proced ureusing vouchers ; haha Bookkeeping procedure using vouchers
通用记账凭证 general purpose voucher ; haha general purpose voucher
他到了宾馆，想要给妻子发封邮件，但是记著邮箱的纸找不到了，于是他凭著记忆把信发到了一个邮箱。
When he reached his hotel, he decided to send his wife a quick E-mail message. Unable to find the scrap of paper on which he had written her E-mail address, he did his best to type it in from memory.
他到了宾馆，想要给妻子发封邮件，但是记著邮箱的纸找不到了，于是他凭著记忆把信发到了一个邮箱。
When he reached his hotel, he decided to send his wife a quick e-mail message.Unable to find the scrap of paper on which he had written her e-mail address, he did his best to type it in from memory.
她记不起人名，但她能凭心里的记忆高唱大量圣诗。
She couldn't remember names, but she sang lots of hymns by heart.
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