The aged population is currently at its highest level in human history. The United Nations predicts the rate of population ageing in the 21st century will exceed that of the previous century.
举一反三
- “21 Century Cup” English Speaking Competition is sponsored by 21st Century.
- The challenge for the next century is managing the much larger population of aged and perhaps dependent people.
- 翻译：The challenge for the next century is managing the much larger population of aged and perhaps dependent people.
- By the middle of the 21st century, the vast majority of the world’s population ____ in cities rather than in the country.
- India’s population of more than a ____________ people is widely expected to overtake the population of China by the middle of the 21st century.