1. I´m going to a rock´n´ roll concert tonight.
    我今晚正要去参加摇滚音乐会.

2. It cuts a clean cylinder of rock, from which can be seen the strata the drill has been cutting through.
    这种钻头能切割一段光滑的圆柱形岩石，从中能看出所钻透的地层。

3. If we could actually see the path described by a particle, such as a sand grain in the rock,
    假如我们真能看到诸如岩石中一个沙粒子的运动轨迹，

4. If there had not been a hard layer of rock beneath the soil, they would have completed the job in a few hours.
    如果不是因为土壤下面有一层坚硬的岩石，他们的营救工作仅用几个小时就可以完成了。

5. If they knew how difficult it was to drill through the hard rock, they would lose heart.
    如果他们知道了钻透那坚硬的岩石有多么困难，他们会丧失信心的。

6. In a marsh, the surface water can sink slowly down through the soil into the rock below.
    在沼泽地里, 地表水会通过土壤慢慢地渗透到下面的岩层里。

7. It might sink slowly through the soil into the natural holding areas in the rock.
    它也许会通过土地慢慢地渗透到岩层里的天然蓄水区；