Having two plane faces or sides.

有二平面的；有二边的。

In a kite; having wings which make an angle with each other.

(风筝翼)相依成二面角的。

Pertaining to wings the side of which are bent slightly up or down.

【空】上反角的。

Angle formed by two intersecting planes.

【数】二面角。

Angle at which each side of the wing of an airplane is bent laterally up or down from the horizontal.

【空】上反角(飞机双翼与横轴水平面所成之角)。