计算两个三维笛卡尔坐标系下的向量 a 和 b 的和，将结果存储在 a 中。 This function adds two 3D Cartesian vectors a and b, modifying a in-place to store the result. (Note: This function is incomplete as it doesn't return the sum)
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计算两个三维笛卡尔坐标系下的向量 a 和 b 的和，将结果存储在 a 中。 This function adds two 3D Cartesian vectors a and b, modifying a in-place to store the result. (Note: This function is incomplete as it doesn't return the sum)