The plane was coming in at a steep angle.

飞机当时正俯冲降落。

《牛津词典》

The expression of complex amplitude is given in reference plane vertical to the optical axis by far-field approximation when the line source and the principal axis are at any Angle.

在柱坐标下从微分波动方程出发，推导柱面光波的场分布，并利用远场近似条件导出当线光源与光轴成任意角度时，在垂直光轴方向的参考面上的复振幅表示。

youdao

In this paper, a unified formulation to determine the terminal currents of an arbitrarily bended cable excited by a plane wave at any polarization angle is presented.

该文给出了架设在地面上的任意弯曲电缆在任意极化平面波照射下，其终端感应电流的通用表达式。

youdao

The newly identified torus is not only much broader and further out, it is also tilted at an angle of 27 degrees to the plane on which the more traditional rings sit.

BBC: New ring detected around Saturn