Just a few years ago, Mr. Maina said, "solar lights" were merely basic lanterns, dim and unreliable.

麦纳说，仅仅几年前，“太阳能照明”还只是一些最基本的电灯，又昏暗又不可靠。

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Firstly, it studies the theory of train aerodynamics and derives the basic control equation of the three-dim.

首先，文章对列车空气动力学的理论进行了研究，推导出动车周围三维流场的基本控制方程。

youdao

Firstly, it studies the theory of train aerodynamics and derives the basic control equation of the three-dim.

首先，文章对列车空气动力学的理论进行了研究，推导出动车周围三维流场的基本控制方程。

youdao