同样的，也许对某人不利的却改善了另一个人的一生。
What might be bad for one person might change another person’s life for the better.
他一生致力于环境的改善。
她一生致力于改善穷人的生活条件。
She spent her life trying to better the living conditions of the poor.
她一生致力于改善穷人的生活条件。
She spent her life trying to better the living conditions of the poor.
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