評論
打印
The pure white nests of cave swiftlets are the main ingredient of bird's nest soup
洞金絲燕的純白燕窩是燕窩羹的主要成分
and, gram for gram, are worth as much as silver.
每克燕窩的價(jià)值堪比白銀
As soon as its nest is removed, a bird will immediately build another,
燕窩被摘去后，金絲燕很快又會(huì)再吐一個(gè)
so as long as this valuable harvest is properly controlled, the colonies will continue to flourish.
所以，只要這種利潤可觀的采摘行為得到適當(dāng)控制，燕群仍舊可以長盛不衰。
These Bornean caves are among the biggest in the world
婆羅洲的這些洞窟是世界上最大的洞穴
and they're still getting bigger as, each year, rainwater eats away a little more limestone.
它們?nèi)栽诓粩鄶U(kuò)大，因?yàn)槊磕暧晁紩?huì)侵蝕掉少許石灰?guī)r。
But water in caves doesn't only erode, it also builds.
可是洞里的水不光只是侵蝕，它們還能造景。
This water is loaded with dissolved limestone,
這些水中含有溶解的碳酸鈣
and when it meets the air in the cave, some of that is deposited as a mineral, calcite.
當(dāng)它與洞內(nèi)空氣接觸時(shí)，其中的一些就會(huì)沉淀為一種礦物，方解石。
As it builds up, so the calcite forms decorations that hang from the ceiling, stalactites.
隨著它的積累，方解石形成了懸在洞頂上的裝飾物，鐘乳石。
Each drop leaves behind only a minuscule amount of calcite,
每滴水珠只會(huì)留下極少量的方解石微粒
but over time, the process can produce some spectacular results.
但隨著時(shí)間的推移，它們變成了最引人入勝的景觀。
