效能有功效的特征或性质 The quality or property of being efficient.
有氧健身法旨在增强循环和呼吸功效的生理调节体系，包括有力的、持久的锻炼，例如慢跑、游泳或骑自行车，从而提高肌体对氧气的利用 A system of physical conditioning designed to enhance circulatory and respiratory efficiency that involves vigorous, sustained exercise, such as jogging, swimming, or cycling, thereby improving the body's utilization of oxygen.
以提高功效为依据可以证明采取这种措施是正确的。 Such action can be justified on the grounds of greater efficiency.
我们正在测试新药的功效。 We are testing the efficacy of a new drug.