它马上转过身回到洞底的沙中去了。
At once it turned and went back into the sand at the bottom of the hole.
海洋的底、 森林的地面、 谷底、 洞底。
The ground or lowermost surface, as of a forest or an ocean.
突然，他们来到一道瀑布前，那瀑布奔泻而下，注入洞底一处地下湖里。
Suddenly they came to a waterfall which dropped into an underground lake at the bottom of the cave.
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