this is a demo of the usage of footnote. this is footnote1 [1]。click it and see what will happen。
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long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. this is a long text. 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this is the explanation of footnote ↩︎