为什么买重疾险？这个问题的答案涉及到多个方面，以下是对这个问题的解析以及英文翻译对照：

首先，重疾险是一种保障人们身体健康的保险产品，当被保险人患有合同中约定的重大疾病时，保险公司会按照合同约定支付相应的保险金。购买重疾险可以为被保险人提供经济保障，帮助其应对医疗费用和康复费用的支出。英文翻译为：Why buy critical illness insurance? The answer to this question involves multiple aspects. Firstly, critical illness insurance is an insurance product that protects people's physical health. When the insured person suffers from a critical illness agreed upon in the contract, the insurance company will pay the corresponding insurance premium according to the contract. Buying critical illness insurance can provide economic security for the insured, helping them cope with medical and rehabilitation expenses.

其次，重疾险可以减轻家庭的经济负担。如果家庭成员患有重大疾病，需要大量的医疗费用和治疗时间，这将会对家庭经济造成巨大的压力。而购买重疾险可以在需要时提供经济支持，帮助家庭渡过难关。英文翻译为：Secondly, critical illness insurance can alleviate the economic burden of families. If a family member is diagnosed with a critical illness, they will need a large amount of medical expenses and treatment time, which will put tremendous pressure on the family economy. Buying critical illness insurance can provide financial support when needed, helping families through difficult times.

最后，重疾险还可以作为一种投资和理财的方式。虽然投资股票、基金等金融产品可以获得更高的收益，但是风险也相对较高。而购买重疾险不仅可以为家庭提供经济保障，还可以通过长期缴纳保险费用来获得一定的投资回报和资金增值。英文翻译为：Finally, critical illness insurance can also serve as a way of investment and financial management. Although investing in financial products such as stocks and funds can yield higher returns, the risks are also relatively high. Buying critical illness insurance not only provides economic security for the family, but also obtains certain investment returns and capital appreciation through long-term payment of insurance premiums.