据全国百分之一人口抽样调查资料显示:当前,我国的人口年龄结构处于由壮年型向老年型转化的过程,并已接近人口老年型。老年人都希望自己生命之树常绿。因此,我们常常看到在公园里、在马路边、在护城河畔、在山脚下、在远离城镇喧闹的地方,伴着晨曦、伴着暮霭,活跃着一个个持之以恒的锻炼身体 According to a sample survey of one percent of the population in the country, at present, the population age structure of China is in the process of transition from the elder-aged type to the elder-type type, and is close to the population-aged type. Older people want their evergreen tree of life. Therefore, we often see one active activity in the park, on the roadside, on the moat, at the foot of the mountain, at the noisy place away from the town, accompanied by the dawn, accompanied by the evening haze