Considering user request

The user provided a sentence in Chinese about UEFA Champions League knockout stage tickets selling out fast and scalpers doubling the prices. They didn't ask a direct question, which makes it interesting! I wonder what they're specifically looking for—maybe a news summary, a report, or some commentary? Since it's not clear, I think I should ask them what they'd like. Should I offer a summary, analysis, tips on buying tickets safely, or something else?Summarizing ticket sale insights

I should provide quick points on why UEFA Champions League tickets sell out: demand, dynamic pricing, allocation, and secondary markets. There’s a risk of counterfeit tickets, so I’ll advise using official resale platforms and monitoring for drops. It's smart to follow club timelines and use payment protection. Plus, local laws on scalping vary. I could suggest building a price tracker, but we should stick to recommended APIs instead of scraping sites. If the user prefers, I could respond in Chinese with practical suggestions and analysis!Crafting a Chinese response

I don't need to run shell commands; instead, I'll create a concise response in Chinese with bullet points. I want to cover key aspects: 1) reasons for the phenomena, 2) price logic in the secondary market, 3) associated risks, 4) ticket purchasing suggestions, and 5) price trend predictions. I should also offer options at the end like: 1) analyzing specific matchups, 2) helping create a ticket reminder checklist, 3) estimating budgets, and 4) summarizing official channel links. Let's keep it to a moderate length!