我现在承担了一项严肃的任务，恐怕这个任务超出了任何人的能力范围。

I am always glad to think that my education was, for the most part, informal, and had its roots in the soil.

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I don't need a reason to be happy. I choose to be.

自然界的存在与任何命题的存在是同一类型的事实。