The boundary on the cold air side is often ill-defined, especially near the surface.
冷空气一侧的边界常常十分模糊，特别是在地表附近。
Stokes I can choose my favorite surface whose boundary is this circle.
定理说，What，Stokes’，theorem，says，is，that,可以选择最喜欢的曲面，只要边界是这个圆就可以了。
Stokes I can choose my favorite surface whose boundary is this circle.
定理说，What，Stokes’，theorem，says，is，that,可以选择最喜欢的曲面，只要边界是这个圆就可以了。
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