it might be a practical joke of some kind.

这可能是男孩小小的恶作剧
But he duly wrote a reply

但是他还是写了回信
politely explaining that the query was nonsense.

礼貌的表明那个问题是毫无意义的
And posted it to the boy who lived in a village called Wall,

信被送到男孩那里一个叫石墙的村子
so named,the boy had said,for the wall that ran alongside it.

男孩说之所以叫石墙村是因为在村子旁边有一堵墙
A wall that,according to local folklore,hid an extraordinary secret.

当地流传着一个传说这堵墙隐藏着一个特别的秘密
I'm charged with guarding the portal to another world.

我的责任就是守卫这个通向另一个世界的入口
And you're asking me to just let you through?

而你居然要我允许你从这通过?
Yes. Because,let's be honest,it's a field.

是啊说实话那只是个旷野
Look,do you see another world out there?

看你有看见另一个世界么?
No. You see a field. Do you see anything nonhuman?

没你看到的是旷野你有看到任何非人类的东西么?
No. And you know why? Because it's a field!

也没知道原因么? 因为那只是个旷野!