Gradient is the angle caused by the inconsistent rising forces of left and rightwings.
坡度是飞机由于左右机翼升力不一致，绕纵轴滚转而形成的一定角度。
2
We rush right down to him, meeting our shadow... the shadow of wings 15 meters across.
非常迅速地，我们看见他与影子汇合…翅膀的阴影横跨有15米。
3
They are from the category Morpho, they are found in South America and their calling card is their absolutely dazzling iridescent wings which from the right Angle has the sheen of aluminum.