然而，这种情况在20世纪70年代中期，美国开始放松对运输业的管制时开始改变。
This started changing, however, in the mid-1970s, when America began to deregulate its transportation industry.
各国必须向国际麻醉品管制局提供关于麻醉物质的详细年度估计情况和报告以便采购或生产受管控的药物。
Countries must provide detailed annual estimates and reports for narcotic substances to the International Narcotic Control Board to procure or produce controlled medicines.
在周三午夜，在没有空中交通管制员指引的情况下，间隔很短的两架飞机降落在Ronald Reagan华盛顿国际机场。
On March 23, two airplanes landed at Ronald Reagan Washington National Airport shortly after midnight without an air traffic controller.
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