slow axis

Savonius wind turbine, invented by Savonius in the 1930s, is a typical resistance-type vertical axis wind turbine. Because of its low rotating speed, the rotor power coefficient of Savonius wind turbine is lower than other types of wind turbines, and the development is slow.

Savonius风力机是典型的阻力型垂直轴风力机，由芬兰萨沃纽斯（Savonius）于20世纪30年代发明，因其转速较低，风能利用系数低于其他类型的风力机而发展缓慢。

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But beam quality of slow axis is easily affected by space burned hole, self-focusing and thermal lens effect, which lead to big slow axis divergent angle under high output power.

然而由于其慢轴方向输出光束质量极易受到空间烧孔、自聚焦、热透镜等效应的影响，致使其在高功率工作条件下，输出的慢轴方向发散角较大。

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A slow westward shift of the equinoxes along the plane of the ecliptic caused by precession of the Earth's axis of rotation.

随着地轴的转动昼夜平分线沿黄道平面向西缓慢移动的过程。

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