边距决定页面的外部边界。

Margins define the outside boundary of your page.

youdao

通过使中间辅助过渡面的边界切矢与弹身的纵向切矢一致，来保证长边条面与翼身融合面间的G-1连续性。

And this ensures that the blending surface between wing and fuselage and the long fringe surface are G-1 connected.

youdao