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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。
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Blockchain technology allows systems to react much faster in the event of a hazard. It also has many other uses in the modern world.
12月20日，龙玥城购物中心，市民在奇趣海洋欢乐城参观。新京报记者 王贵彬 摄
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