大家看看：两个棱镜分光系统

ggll

大家帮我看看这是怎么回事啊，怎么没有光出来啊

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ggll

我用一个棱镜，可是还是没有光出来。我也有点不明白了，请大家帮哈忙看看是怎么回事？谢谢

ggll

怎么没有人回答啊
太简单了吗?