That is the O.E.D. 's greatest value - as a guide to our spoken and written history.
这才是O.E.D .的最大价值——它引导我们了解英语口语和书面语的历史。
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What prompted those thoughts was the success of the online version of the O.E.D., as it is usually called, and the limited sales of the printed 20-volume edition.