Like all human needs such as food and education(广泛、一般性的背景资讯),health care is one of these important concerns(聚焦到本题要写的重点).Services like vaccinations or even surgeries are free in some countries but not in others(说明本议题的主要两方看法).Whether or not all people should receive free health care,even those who are responsible for harming themselves,this is the question we aim answer here.There are different opinions regarding this situation.(表明作者并无确定的立场，同时也预告后面段落将说明各种意见的优缺点)
Environmental pollution has become a serious problem all over the world(广泛、一般性的背景资讯).However,we do not usually try to improve our environment.We always use chemical detergents and fertilizer.Also forests have been fatally damaged by deforestation.(聚焦)Some researchers say that if we do not stop devastating the environment,the Earth will be catastrophic 100 years later.To prevent this drastic situation,this essay will suggest what we should do and how the government should solve the problems.(预告后面段落的内容)
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