But the dissolving power of rainwater has other, much more dramatic effects underground. 不过在地下 雨水的溶解作用 还能产生其它更壮观的效果

50. Originally, this whole area would have been one solid block of limestone,
    起初 这整个地方都是 一整块坚固的石灰岩床
51. the base of a coral reef.
    珊瑚礁的基座
52. In Borneo, rain has sculptured the limestone into extremely sharp-sided pinnacles.
    在婆罗洲 雨水已将石灰岩 雕凿成无比尖削的石塔
53. But the dissolving power of rainwater has other, much more dramatic effects underground.
    不过在地下 雨水的溶解作用 还能产生其它更壮观的效果
54. Rivers that flow over limestone often seem to completely disappear.
    流经石灰岩的河川 到最后似乎总是无影无踪
55. When the water reaches the more resistant bed of limestone
    当水流遇到更坚硬的石灰岩床时
56. its course is altered.
    就会改变路线

来自《行星地球 第一季 第四集 Planet Earth S01E04 洞穴》第 53 行