middle- and old-age的用法和樣例：
例句
- This system can be used to the high contagious disease and old patients.
該系統特別適用於高傳染性疾病的治療與中老年患者。 - Study on the correlations between serum estrogen level and heart function of coronary heart disease and the evaluation of exercise test in the middle and aged women.
中老年婦女血清雌激素水平與冠心病心功能相關性及運動試驗診斷價值的研究。
