可能的边际效益
Possible marginal benefit
以上为机器翻译结果，长、整句建议使用 人工翻译 。
(作为区域垄断，他们的价格被设定，边际效益由监管者保证)他们坚实牢固的信用评级可能被溶解。
(As regional monopolies, their prices are set and their profit margins are guaranteed by regulators.) their solid credit ratings could liquefy.
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