某位澳大利亚访客写道，我试图去了解我们太阳到运行速度和如果要绕银河系一圈要花多少年？
An Australia visitor wrote, I seek to find out what speed our sun is traveling at and also how many years does it take to circumnavigate the galaxy?
某位澳大利亚访客写道，我试图去了解我们太阳到运行速度和如果要绕银河系一圈要花多少年？
An Australia visitor wrote, I seek to find out what speed our sun is traveling at and also how many years does it take to circumnavigate the galaxy?
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