By frame 6, the Nile River has become the focus of the image, though its distinctive triangular delta is partially covered with cloud.
到第6帧图像的时候，尼罗河成为了图像的焦点，然而云层覆盖住了那里独具特色的三角洲的一部分。
2
The effect of model indicates that the Delaney triangle method of constructing using cylindrical reference frame is an important basic method of constructing triangular grid model.