While one airport reports that due to nonprofit and federal regulations, it has equal revenues and costs, the vast majority of revenues and costs are not equal.
參考答案:while 在句中引导对比句，翻译为：但是....，与之相对的...
有一机场对外宣布因为利润微薄和联邦政府的管制，它的收与支仅仅能保持平衡，但是还有大多数的机场收支连平衡都无法维持。
