1. Health authorities in China worked to locate and stop the spread of malaria by providing preventive medicines（提供预防性的药物pl.）for people at risk of the disease（这种疾病的风险）as well as treatment for those who had fallen ill（已经得病）.

2. What are the keys to success（成功的关键）? China provides a basic public health service package （一套基础公共卫生服务包）for its residents（居民pl.）free of charge.

3. To prevent the environmental deterioration/degradation/worsening（环境恶化）, the country has stepped up its air quality surveillance（大气质量监督）in at-risk zones and has engaged actively（积极参与）in regional management initiatives（区域管理方案）that may turn out significant influence/impact on the global/world climate (可能成为对全球气候的巨大影响).

4. Since many countries with malaria are already among the poorer nations（较贫穷的国家）, the disease maintains a vicious cycle of disease and poverty（疾病与贫困的恶性循环）.

5. Located on the north coast（位于北部海岸线）of the island of Borneo in Southeast Asia（东南亚）, Brunei is a country completely surrounded（完全被环绕的）by the Malaysian state of Sarawak apart from the South China Sea coast（中国南海海岸线）.