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The essence of mathematics lies in its freedom.
形容人心难以捉摸,民众的行为像烟一样飘忽不定。
Every ton of coal extracted should carry the weight of our commitment to the future.
正是在我们最黑暗的时刻,我们必须集中精力看到光明。
Everyone wants a better life: very few of us want to be better people.
The beauty of organic catalysts lies in their diversity and adaptability.