大多数环境污染问题的存在，是因为过去没有采取适当的保护措施。(because)Most environmental problems exist because

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问题大多数环境污染问题的存在，是因为过去没有采取适当的保护措施。(because)

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答案 Most environmental problems exist because adequate measures for preventing them were not taken in the past.

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