Youth is the time of getting, middle age of improving, and old age of spending.
青年是收获的阶段，中年是提升的阶段，老年是消耗的阶段。
The paper discussed the function of milk powder for middle and old age.
对中老年奶粉进行了润肠通便调理胃肠的保健功能研究。
The score of old and middle age teachers was higher than that of young teachers.
中老年教师的尽责性特质显著高于年轻教师。
The score of old and middle age teachers was higher than that of young teachers.
中老年教师的尽责性特质显著高于年轻教师。
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