| 1. | At last the base of the cliff is undermined .
岩壁的下壁终于被掘空。 |
| 2. | The rock walls sometimes supply heat, sometimes absorb it .
岩壁有时放热，有时吸热。 |
| 3. | There is good evidence that pure water affects nothing in wearing away rock .
有确实的证据可以证明，清水在侵蚀岩壁上是不发生影响的。 |
| 4. | Due to the effect of a flow of cool air along the rock walls, the original rock temperatures are disturbed .
由于冷空气沿岩壁流动影响，原始岩石温度受到了破坏。 |
| 5. | If the surrounding rock is soft and is later worn away, the walls remain and form ridges called dikes .
如果围岩柔软，日后又被剥蚀掉，这种岩壁就下来形成山脊，称为岩墙。 |
| 6. | The towering vertical walls make an emergency exit impossible
岩壁高耸陡峭，根本无路可逃。 |
| 7. | Old bolts must not be left protruding from the rock surface
留在岩壁上的老旧固定支点决不能凸出岩面。 |
| 8. | Night had almost come when i laid my hand on its rough sides
当我的手触到粗糙的岩壁时，夜幕几乎降下来。 |
| 9. | The cliffs are riddled with caves
岩壁上布满洞穴。 |
| 10. | The “ rock ” walls at an indoor gym are not really made of rock at all
室内攀岩场的岩壁并不是真的岩石。 |
