// 易错点2：漏写stack.length判断 → 栈空时访问stack[-1]会报错
为什么它们很重要： 如果没有 <start_function_response，模型在函数调用后不会暂停，而是会错误地获取响应。这两个标记都必须在模型转换为 .task 格式时设置。
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As usual, though, the Ultra model is where Samsung is pushing the envelope the furthest. It gains the most advanced camera system, faster wired and wireless charging and the company’s new built-in Privacy Display tech. Pre-orders are available now, with official sales starting on March 11. If you’re trying to decide which model makes the most sense for your needs (and budget), here’s how the three devices stack up on paper.