日本足协官方：任命前湘南丽海主帅山口智为U20国家队新帅（日本足协官宣：前湘南丽海主帅山口智出任U20国青主帅）

Planning my response

I’m thinking about crafting a final answer. I’ll include a one-line English translation, which feels necessary. Then, I want to ask what the user would like to know—whether it’s about background, style/fit, timeline/tasks, squad pipeline, or the recent U-20 schedule. I’ll also offer to draft a short news post or social copy. Since the user communicated in Chinese, I’ll respond in that language while keeping it concise!