他指出，尽管早在20世纪20年代，美国就建立了记录每一笔股票交易的数据库，但许多病人甚至现在都没有自己的个人医疗记录。
He noted that while the U. s. has a database of every stock transaction dating back to the 1920s, many patients can't even liberate their own personal medical records.
学习者语料库是通过收集语言学习者各种笔语和口语的自然语料而建立起来的一种语言学习数据库。
A learner corpus is a language data bank collecting and processing all sorts of written and oral language materials of language learners.
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