单词	ecological footprint
释义	ecological footprintˌecological ˈfootprint noun [countable] the amount of land needed by a person, group of people, or a society in order for them to have enough food or resources to live and continue to exist
随便看	side-on side order side road side-saddle side-scrolling sideshow sidesplitting sidestep side street sideswipe sidetrack side-view mirror sidewalk sideways side-wheeler siding sidle SIDS siege Siegel, Bugsy Siege of Sidney Street Siegfried Line sienna sierra Sierra Club

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