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Insects seem irresistibly drawn towards the source and then get trapped by the sticky lines.
昆蟲總是禁不住光源的誘惑，結果就被這些粘乎乎的絲拿住了
Once stuck, there is no escape.
一旦被粘住，根本沒有脫逃的機會。
Now it's just a matter of reeling in the line and slowly consuming the catch alive.
現在，它只需收起絲線，然后慢慢吃掉尚且活著的獵物。
By ensnaring the insects that hatch in this cave,
通過誘捕洞穴內羽化的昆蟲
these glow-worms have solved the biggest challenge
這些螢火蟲成功地解決了終生穴居動物面臨的最大難題
that permanent cave-dwellers face, finding a regular and reliable source of food.
即找到長期而可靠的食物資源
One kind of rock makes this whole underground world possible, limestone.
這些地底世界之所以會存在，都是因為一種巖石，石灰巖。
Most of the world's caves are found within it and it covers nearly 10% of the Earth's surface.
世界上大部分洞穴內都存在石灰巖，它覆蓋了地球表面將近10%的面積。
Limestone is composed of minerals derived from marine shells and corals.
石灰巖由海螺和珊瑚中的礦物沉積后形成
So although this rocky escarpment in the United States
所以，盡管美國境內的這座石壁，
is now hundreds of metres above sea level, it was actually formed underwater.
如今矗立在海平面以上幾百米高的地方，它實際上卻是在水下形成的。
