middle and high age population

• 中老年人群

middle and high age population的用法和样例：

例句

1. Conclusion In middle-aged and old people, age was increasing while BMD was decreasing and the morbidity of osteoporosis was increasing, especially in women.
   结论在中老年人群，随着年龄的增大，骨密度逐渐降低，骨质疏松的患病率明显增加，尤其在女性更为明显。