平均数的计算公式简介：When she turned her eyes to look over, all the background behind her gradually blurred, like a montage, and the lens in her field of vision gradually lengthened, making Su Can's heart beat restlessly.
When she turned her eyes to look over, all the background behind her gradually blurred, like a montage, and the lens in her field of vision gradually lengthened, making Su Can's heart beat restlessly.
