中文打字我实在太差。现在用英文试试看。希望能多写点。如果大家需要，我可以再翻译。I will write in easy English to make it more accessible to all.
The blog site was not very stable in the past few days. Many thanks to xdanger, Livid, and Jianshuo, it is all fixed now and faster than before. Please thank them for me!
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