And proposed a kind of accurate and feasible method of evaluate arc model under the condition of small unfold Angle.

并提出一种精确可行的在小展角条件下标定圆弧样板的方法。

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From its low Angle on the horizon, the sun's rays never shine over the peaks into the valley, until heliostats unfold on these peaks and redirect the rays down to form the oasis of sunlight.

从它的地平线低角度来的太阳光芒永远不会越过山峰照耀进山谷，直到定日镜展开在这些山峰然后重定向光线，形成阳光绿洲。

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