VOA慢速英语:Another World, Underground: Carlsbad Caverns National Park in New Mexico

例句：Downward movement is much faster than upward one.
      向下移动比向上移动快得多。

      Prices have an upward tendency.
      价格有上升的趋势。

2.dissolve vt. vi.溶解,使（固体）溶解

例句：The sun dissolves snow.
      太阳使雪融化。

3.description n.描述, 形容

例句：Can you give me a description of the thief?
      你能给我描述一下那个窃贼的模样吗?

      A comprehensive description is one that is full and complete.
      一篇详尽的描写就是一篇充实完整的描写。

4.gaze vi.凝视；注视；盯着

例句：The climbers stood on the top of the mountain, gazing at the splendid view.
      登山队员们站在山顶, 凝视壮丽的景色。

      Never in his life had he gazed on such splendor.
      他生平从没有见过如此辉煌壮丽的场面。

5.perch vt.vi.栖息；停留

例句：The bird perched on a big branch.
      鸟栖息在一根大树枝上。

（使）坐；（使）坐在…边沿

例句：The village is perched on top of a high hill.
      村子坐落于一个高山顶上。