The flat land and sparse population and relative lean soil cause forest management to depend on mechanization and intensive cultivation and old-aged harvest system.
土地平整、人口稀少、土壤肥力较低，是该林业公司机械化作业、集约化经营、主伐年龄较大的缘由。
Conclusion The incidence of SAE in middle - old aged knowledgeable population needs more careful investigation in greater population.
结论SAE在中老年知识分子人群中的发生率有待在更大人群中做进一步调查。
Objective to analyse cardiovascular health status and risk factors of middle-old aged population in Nanning city.
目的对南宁市中老年人心血管健康状况及其危险因素进行分析。
Mild depression, the age onset of widespread, high-risk population is a four-year-old middle-aged males.
轻度抑郁症发病者的年龄分布广泛，高发人群属三四十岁的中青年男性居多。
Mild depression, the age onset of widespread, high-risk population is a four-year-old middle-aged males.
轻度抑郁症发病者的年龄分布广泛，高发人群属三四十岁的中青年男性居多。
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