Communication is one of the most important bonds that hold cultural systems together.
A、obligationsC
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Thewheelsofthefirstroadvehicleswerefashionedfromcrudestonedisks.
Formulatedin1823,theMonroeDoctrineassertedthattheAmericaswerenolongeropentoEuropeancolonization.
Communicationisoneofthemostimportantbondsthatholdculturalsystemstogether.
Someanimalspantandsweattospeedevaporationofbodymoistureandthuscoolthemselves.
ThefuturesurvivalofthebaldeagleisstillanimportantAmericanecologicalconcern.
