Transform.postRotate(float angle, float ax, float ay, float az): Rotates the object with the given angle around the axis that goes through (0, 0, 0) and (ax, ay, az).
postRotate(float angle, float ax, float ay, float az)：按给定角度绕穿过（0, 0, 0）和（ax, ay, az）的轴旋转对象。
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