The groove depth is bit bigger than the size of the coil section height.
槽深略大于线圈截面高度尺寸。
Towards the flap tip the construction height decreases again to pass to the standard cross-section.
接近桥翼顶端的时候，结构高度在此减小至标准截面高度。
Towards the flap tip the construction height decreases again to pass to the standard cross-section.
接近桥翼顶端的时候，结构高度在此减小至标准截面高度。
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