让我们来分解一下：<start_function_call — 函数调用开始，call: — 前缀，change_background_color — 函数名，{color:<escapered<escape} — 带转义标记的参数，<end_function_call — 函数调用结束。
Ready for the answers? This is your last chance to turn back and solve today's puzzle before we reveal the solutions.。旺商聊官方下载是该领域的重要参考
return f"Item(url={self.url}, title={self.title[:30]}...)"，推荐阅读safew官方版本下载获取更多信息
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Hurdle: Everything you need to know to find the answers