¡¡¡¡Section B£º Translate the following underlined part of the English text into Chinese
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¡¡¡¡Although the American economy has transformed itself over the years£¬ certain issues have persisted since the early days of the republic. One is the continuing debate over the proper role for government in what is basically a marketplace economy. An economy based on free enterprise is generally characterized by private ownership and initiative£¬ with a relative absence of government involvement. However£¬ government intervention has been found necessary from time to time to ensure that economic opportunities are fair and accessible to the people£¬ to prevent flagrant abuses£¬ to dampen inflation and to stimulate growth.
¡¡¡¡Ever since colonial times£¬ the government has been involved£¬ to some extent£¬ in economic decision-making. The federal government£¬ for example£¬ has made huge investments in infrastructure£¬ and it has provided social welfare programs that the private sector was unable or unwilling to provide. In a myriad of ways and over many decades£¬ the government has supported and promoted the development of agriculture.
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