minor未成年人
self recognition对自我价值的认识
only child独生子女
self-centered?以自我为中心的
the elderly and the family?老人和家庭
life expectancy?预期寿命
to become common practice?蔚然成风
well-being幸福， 福利
respecting the old and loving the young尊老爱幼
population and family planning人口与计划生育
incentive?鼓励， 刺激
curb?限制， 抑制
consumption消费
institute设立， 制定
penalty惩罚
census人口普查 www.yyzuowen.com
population density人口密度
densely/sparsely populated人口稠密/稀少
aging of population人口老化
family planning计划生育
to practice family planning实行计划生育
to curb population growth控制人口增长
to have fewer and but healthier children少生优生
baby boom生育高峰
environment protection环境保护
ecological生态的
prerequisite/precondition先决条件
sustain维持
exploit/develop开发， 利用
perspective观点， 看法
extinction（生物）灭绝
deteriorate恶化
urbanization都市化
