建议资产负债表和现金流量表页面增加几个关键比率：
Receivable days = Ending receivables / Sales * 365
Payable days = Ending payables / Cost of goods sold * 365
Inventory days = Ending inventories / Cost of goods sold * 365

Debt/Equity : Financial leverage
Debt/EBITDA : Ability to repay debt
EBITDA/Interest Expense : Ability to pay interest

Capex / Sales : How capex intensive is the business?
Sales / Net PP&E : PP&E"周转率"
Capex / Depreciation : Is PP&E growing?

@linan