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It's been a long time since the last time I posted something here. I only used this as a way to preserve the name. However, today it suddenly occurred to my that what if my WeChat public account is deleted? I do not write anything sensitive, but it is still possible that china will launch a huge clearance act and delete all the accounts that they deem not good. So, I decide to copy all the contents here. China cannot delete this one. haha.