Of a sudden the earth fell in before us, and we saw an old iron grill over a black hole.

突然间，地球坠落在我们面前， 我们看到一个黑洞上方有一个旧铁格栅。

Unfortunately, I made it far too large, for, later on, the earth fell in from the roof; and had I been in it when this took place, I should have lost my life.

不幸的是，我把它弄得太大了，因为后来，土从屋顶上掉了下来；如果发生这件事的时候我也在里面，我会失去生命。