You do understand the Dewey decimal system, don't you ?
杜威图书十进制分类法您明白 吧 ?
出国英语口语25天快训
I told him about the Dewey Decimal System for shelving books.
我教他如何用杜威十进制方法整理图书,他很快就领会了.
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英英释义
Noun
1. a system used by libraries to classify nonfictional publications into subject categories; the subject is indicated by a three-digit numeral and further specification is given by numerals following a decimal point; publications are shelved by number