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PDF Paper具体可参考这篇;详细可参考这篇
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N-UNCOUNT（不可数名词） PDF files are computer documents which look exactly like the original documents, regardless of which software or operating system was used to create the original documents. PDF is an abbreviation for 'Portable Document Format'. 可移植文档格式 [计算机] [usu N n]
The leaflet is in PDF format.
这个传单用的是可移植文档格式。