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diff - Can I see changes before I save my file in Vim?

I use Vim. I open a file. I edit it and I want to see what I've edited before I save it.

How can I do this in Vim?

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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…
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