五大联赛U21球员每90分钟关键传球次数：卡尔第1，亚马尔第2（五大联赛U21球员关键传球／90分钟榜：卡尔居首，亚马尔次席）

Clarifying dataset request

I think asking the user for clarification would be the best first step. I could offer to compile data if they provide a specific timeframe. It’s important to explain what "key pass per 90" means, and I should check if they define U21 as players born after a certain date. I could propose thresholds, like 900 minutes played. As for potential players, I’m considering Lamine Yamal, Florian Wirtz, and Jamal Musiala, but clarification is essential! It could also help to ask the user for more details on their queries.Seeking clarification on metrics

Given the guidelines, I want to keep my responses concise but clear. I need to ask some clarifying questions. First, I could offer options: 1) Verify with the latest data, 2) Explain the metric, or 3) Produce a visualization if data is provided. Since I'm unsure of some details, I want to clarify the season time window, the minute threshold, and U21 definition. I should also check if they need a full list, top 10, or just comparisons for certain players. Lastly, asking about the source for the data is essential!Clarifying user input

I realize I don’t have enough information, so I should ask the user for clarification. I can propose a template to compute key passes per 90 using a CSV of match events. The formula is key_passes_per90 = key_passes / minutes * 90. To avoid small sample sizes, I can suggest typical minimum thresholds of 450 or 900 minutes. I can offer to generate code for ranking if they provide data or suggest pulling data from FBref. Additionally, I want to confirm details about "卡尔" to understand which Carl they mean.