Well, this particular stretch wouldn't be recovered.

因为这个特定路段不会回。

So they were kind of backfilling the details.

所以他们有点回细节。

You have to remember, the D block you backfill.

你要记住，D你要回。

Once you've kind of backfilled those D blocks then you come over here and you start filling the P block.

一旦你回了那 D ，后你就来，开始 P 。

There, once again, are exceptions in these transition metals right here that for the most part are going in backfilling that D block.

再一次，这里的这渡金属有例外，它们大部分都用于回 D 。

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，后用粘土回隧道，以便永远保留。

Once the building is safely supported, each pile will be enclosed in a concrete vault below the ground, everything will be backfilled, and the sidewalks will be replaced.

一旦建筑物得到安全支撑，每根桩都将被封闭在地下的混凝土拱顶中，所有东西都将被回， 人行道将被更换。

Its tunnels were built using a method known as cut-and-cover, where rather than boring a tunnel through the ground, instead, a massive trench is dug, the railway built, and then the trench roofed over again.

地铁隧道是以明挖覆盖式工法兴建，不直接挖穿地面，而是挖掘坑道、兴建铁路轨道，再将地面回。