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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Фото: Игорь Иванко / Коммерсантъ，这一点在Line官方版本下载中也有详细论述
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