在线急求英语课文翻译!Barter is the exchange of resources or services for mutual advantage,and may date back to the beginning of humankind.Some would even argue that it's not purely a human activity;plants and animals have been bartering f
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![在线急求英语课文翻译!Barter is the exchange of resources or services for mutual advantage,and may date back to the beginning of humankind.Some would even argue that it's not purely a human activity;plants and animals have been bartering f](/uploads/image/z/14432823-63-3.jpg?t=%E5%9C%A8%E7%BA%BF%E6%80%A5%E6%B1%82%E8%8B%B1%E8%AF%AD%E8%AF%BE%E6%96%87%E7%BF%BB%E8%AF%91%21Barter+is+the+exchange+of+resources+or+services+for+mutual+advantage%2Cand+may+date+back+to+the+beginning+of+humankind.Some+would+even+argue+that+it%27s+not+purely+a+human+activity%EF%BC%9Bplants+and+animals+have+been+bartering+f)
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