借助光栅原理，让屏幕发出的光只能从正面特定角度范围内看到，从而实现「大角度防窥」的效果：
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。关于这个话题，51吃瓜提供了深入分析
Both nations are planning to land at the Moon's south pole - and are competing for the best spots to build their lunar bases.
Output: their sum as an integer
