我是想写第21个题目:In general, people are living longer now. Discuss the causes of this phenomenon. Use specific reasons and details to develop your essay. 可参考了作文topic summary,不知该如何翻译:1、医学发展,医生知道更多what causes diseases, how to care it.以前只知道basic diseases。2、护理更好。 营养,促进体质。让生理心理更加成熟发展。 谢谢各位能人帮忙!