一光年的距离是如何测量出来的(2分钟了解一下一光年)
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一光年约等于9.46兆公里，它是一个长度单位！今天的这个网站就是让我们从数字和实例中了解光年，没有冗长的报告式介绍，简单明了，使你秒懂一光年。。。
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