| 1 | Slope excavation will influence the original stress field inside the natural slope. | |
| 2 | Years before, men had dug the mine shaft straight back into the mountain. | |
| 3 | She put together a team to excavate the site and is writing a book about her findings. | |
| 4 | Another way to dig up fewer streets is to avoid unearthing cables for small repairs. | |
| 5 | But the levels are far too low to make it worth opening a lunar silver mine. |