Your question is Design a Bot-Preventing Verification System. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
设计一个16个图标的防机器人的验证系统
English gloss: Design an anti-bot verification system using 16 icons, CAPTCHA-style. Asked in the onsite_virtual stage, Round 1 system design. Explain the end-to-end design, including challenge generation, client rendering, answer validation, risk scoring, abuse prevention, model training, and monitoring. Clarify assumptions rather than inventing product scale or business context.