The mathematic model has four degrees of freedom (surge, sway. yaw and roll), taking the couple motion of roll on horizontal plane motion into account.

预报采用进退、横漂、首摇和横摇四个自由度的方程，考虑了横摇对水平面运动的耦合影响。

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Using the analytical relationship, many boundaries namely scissors sketed, could be drawn on the parameter plane of horizontal tail area and aeroplane center of gravity.

利用这种解析关系，可以在平尾相对面积和飞机重心位置的参数平面上，绘制出各种限制边界，形成所谓“剪刀图”。

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The home comprises of a gentle sloping roof plane resting on two dark, horizontal cedar board masses.

该住宅有舒缓的坡屋顶，它搁在两个暗色的横向雪松板块体上。

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And experimentation is what facilitated their arrival as rising design stars: Simon and Nikolai used flat hexagonal brass tiles typically able to adjoin only on a horizontal plane to clad the rounded surfaces of a footstool for an exhibit of functional objets d'art at Manhattan's R 20th Century Design gallery.

WSJ: The Wonder Twins of the Design World: Nikolai and Simon Haas | Designers

This is a special type of Earth model which traces its idealised "horizontal" surface - the plane on which, at any point, the pull of gravity is perpendicular to it.

BBC: Europe's Goce satellite probes Earth's gravity