We basically brought rubble from elsewhere in the city and used it to backfill destroyed bridges and roads.

我们从城市的其它地方运来碎石，然后填补毁坏的桥梁和道路。

You have to remember, the D block you backfill.

你要记住，D块你要回填。

If we disappeared tomorrow, there might be enough idled capacity to backfill what we currently produce, but it would come at an extraordinarily high cost.

如果我们明天消失，可能会有足够的闲置产能来补充我们目前的生产，但成本会非常高。

They'll dig long tunnels with small holes in which they'll place casks of nuclear waste then backfill the tunnels with clay to be left for an eternity.

他们将挖掘带有小孔的长隧道，在其中放置核废料桶，然后用粘土回填隧道，以便永远保留。