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Abstract: The economic problem arises because people want to make their lives better. This is a fundamental part of human natur...

Country: Australia Duration: 21 mins Viewers: 358

Abstract: See the famous car in the world， they are more angular， wider， lower slung， and they have very powerful engines. That...

Country: Germany Duration: 15 mins Viewers: 350

Abstract: What factors restrain the development of human society? Industries develop unevenly worldwide and people from differe...

Country: Australia Duration: 31 mins Viewers: 12

Abstract: Most trips are made for the purposes of holiday and leisure. For the tourist， this means a time of relaxation， fun an...

Country: Australia Duration: 22 mins Viewers: 10

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