This is the biggest underground lake yet discovered.
这是迄今为止所发现的最大地下湖。
Suddenly they came to a waterfall which droped into an underground lake at the bottom of the cave.
他们突然遇见一条瀑布，它直泻入洞底的地下湖里。
Suddenly they came to a waterfall which dropped into an underground lake at the bottom of the cave.
突然，他们来到一道瀑布前，注入洞穴一处地下湖里。
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