帮我翻译一下下面几句话,谢谢.
1.There have been many cases throughout history in which governments have been unwilling to let markets adjust to market-clearing prices.
2. If it does not buy the surplus.
3.In another reading selection we noted that it was possible to explain the gasoline shortage and the resulting queuing in the early 1970s in terms of a good-versus-bad model.
4.Though a swing back to an emphasis on growth seems to have started during the past fifteen or twenty years.