1. 过去十年，中国的高铁网络已延伸到众多中小城市。（In the past ten years, China's high-speed rail network has extended to many small and medium-sized cities.）
2. 随着老龄化加剧，完善养老体系成为社会关注的焦点。（With the deepening of aging, improving the elderly care system has become the focus of social attention.）
3. 垃圾分类不仅能保护环境，还能提高资源的利用率。（Garbage classification can not only protect the environment but also improve the utilization rate of resources.）
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