本来想试试因式分解的 分不出来 哭瞎！
--------Instead of being disappointed about where you are. Think optimistically about where you are going.
--------Instead of being disappointed about where you are. Think optimistically about where you are going.
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--------Instead of being disappointed about where you are. Think optimistically about where you are going.
--------Instead of being disappointed about where you are. Think optimistically about where you are going.
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