intros：{"brand_intro":"卡西欧（Casio）是日本知名电子仪器制造商，成立于1946年。以计算器、手表、电子琴等产品闻名全球。其科学计算器系列凭借高精度、耐用性和丰富功能，长期占据中国教育市场主导地位，是初高中及大学生数学、物理、化学考试的指定用机。品牌以\"创造与贡献\"为理念，持续推动计算工具智能化。","product_intro":"fx-991CN X 是卡西欧专为中国市场打造的中文菜单函数计算器，支持微积分、矩阵、向量、复数、方程求解等高级运算。配备高清液晶屏和太阳能+电池双电源，续航持久。内置498种计算功能，可进行定积分、不定积分、导数、求和等微积分核心操作，是工程与理科学生的性价比之选。","key_specs":["显示行数：4行×16字符，中文菜单","积分功能：支持定积分与不定积分计算","导数功能：支持一阶导数与高阶导数","电源：太阳能+纽扣电池双供电","功能数量：498种计算功能","适用考试：全国高中数学联赛、大学理工科考试"]}
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