This grain of sand is probably about three and a half or four billion years old, and it's never eroded away like the way we have sand on Earth erodes away because of water and tumbling, air, and so forth. All you can see is a little bit of erosion down here by the Sun, has these solar storms, and that's erosion by solar radiation.
这粒沙大概有 三十五亿到四十亿年的历史了 它没有像地球上的沙那样 受到水分，碰撞 空气等的侵蚀 只有看到的极小的侵蚀 来自太阳 像是太阳雨 和太阳辐射