The amount of debt that they can incur is usually governed by various ratios such as Fixed Charge Coverage ratios, Debt-to-EBITDA ratios, Debt-to-Capital ratios, and etc.

其所能发生债务的金额通常受不同比率的控制，如固定费用比率、债务与未计利息比率、债务与资本比率等等。

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Back in the late '80s, Drexel Burnham was busy coming to market with a succession of shaky leverage buyout deals with fixed-charge coverage ratios of just one times.

FORBES: Magazine Article

For cyclical properties like airlines, industrials and even hotels, fixed-charge coverage of just one (suggesting that a company's earnings are just enough to satisfy debt, lease and principal repayment over the next year) can evaporate overnight.

FORBES: Magazine Article