单词	Ordnance Survey
释义	Ordnance Survey, theˌOrdnance ˈSurvey, the (abbreviation OS) an official organization which makes very detailed and correct maps of Britain and Ireland. The maps are used by people walking in the country, and each map has its own OS number. → US Geological Survey
随便看	difficulty diffidence diffident diffidently diffract diffraction diffuse diffuseness diffusion dig digerati digest digestible digestion digestive digestive biscuit digger diggings Digibox digicam digipack digit digital digital divide digital immigrant

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