footnotesep
is the space between footnotes:
setlength{footnotesep}{0.5cm}
footins
is the space between the text body and the footnotes:
setlength{skipfootins}{2cm}
You might want to play around with the actual numbers, I've just chosen some values where you will actually see the difference.
与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…