“盈利能力”常见的英文表达是 profitability。
例如：
We need to assess the company's profitability before making an investment decision.（在做出投资决策之前，我们需要评估这家公司的盈利能力。）
The new product line has significantly improved the company's profitability.（这条新产品线极大地提高了公司的盈利能力。）