听说月球在以每年四厘米的距离离开地球，这是不是真的？
<iframe src="//player.bilibili.com/player.html?isOutside=true&aid=116873827981079&bvid=BV1DXTd6fEjS&cid=39696075118&p=1" scrolling="no" style="width: 900px; height: 680px;border="0" frameborder="no" framespacing="0" allowfullscreen="true"></iframe>
页:
[1]