I strongly agree with Lisa that it is advances in medical technology that extend our lives.

Today, with the rapid development of medical technology, the Black Death, which once claimed a third of Europe's population, is under tight control. Even in the deadliest cases of AIDS, life expectancy can be extended by 10 years with regular treatment. We must acknowledge that the progress of medical technology plays an irreplaceable role in maintaining the quality of human life in later life and in the fight against deadly diseases.

While John raised the relevant point that government services such as clean drinking water and sanitation systems help reduce health problems, he overlooked that this situation could only be possible in developed countries. In most of the underdeveloped countries, for example, India and South Africa, insufficient medical resource is still an acute problem.

Overall, I believe it is medical technology that plays the most crucial role in improving human life expectancies.