And the Belizean white crab is another creature that is unique to just one cave system. 而伯利兹白蟹是另一个 洞穴生态系统中的特有物种
cut off from the outside world and from other caves. 与外界及其它洞穴隔绝
and this gives them something to aim at. 这也给了它们瞄准目标的机会
that we've come to appreciate the full significance and scale of these flooded passageways. 我们才能完全了解 这些地下水道的重要性及其规模
And when stalactite meets stalagmite 钟乳石与石笋相遇后