We can only see their outsides, and the theories we have probably get their insides wrong.

我们只能从外部管，而目前的有关理论也可能是错的。

But larger dunes, towering over 60 meters, are more stable, revealing signs of a much bigger picture.

但大点的沙丘堆积 60 多米，更加稳固，可供旅人对沙漠管番。

On the other hand, perhaps those things do mean something (or will, when you get a chance to look at the forest instead of the trees) .

另，也许这些东西确实另有深意(或者，它会变得有深意，等到你放眼全局，而不是管、只见斑的时候）。