Read a passage about Epiphytes from a biology textbook.
请阅读这篇选自生物课本的关于附生植物的文章。
You will have 50 seconds to read the passage.
你将有50秒的时间阅读文章。
Now listen to part of a lecture from a biology class.
请听生物课上的部分内容。

OK, so a good example of this type of plant, common to the rainforest, is the Urn plant.
关于这类在雨林中很常见的植物，有一个很好的例子就是美叶光萼荷。
The Urn plant wraps its roots around the branches of the trees or sometimes around the trunk near the upper part of the tree.
美叶光萼荷会用它的根包裹住树木的枝干，或者有时候也会包裹住靠近树木上端的躯干。
They use the trees for support and this allows them to reside high in the trees, in the canopy, where they can get plenty of sunlight.
它们把树作为支撑，这样就可以在树上很高的地方——树冠上扎根了，它们在树冠上可以获得大量的阳光。
Now, the Urn plant has a unique shape.
美叶光萼荷的形状很独特。
It got its name because of the formation of its leaves creates a kind of urn or bowl where it can store water.
它得名“美叶光萼荷”是因为它的叶子构成了像瓮或者碗一样的形状，可以用此储藏水分。
The Urn plant has rather long stiff spiky leaves.
美叶光萼荷的叶子很长，又硬又尖。
The leaves are slightly overlapping and are tightly rolled into a kind of cone shape or a funnel shape.
这些叶子部分重叠，紧密地卷成了一个类似圆锥形或者漏斗一样的形状。
Its flowers are held on a single stem in the center.
它的花是由中心的一根茎干单独托起的。
Anyway, as I mentioned, the arrangement of the leaves forms a kind of receptacle or bowl at the base
不管怎样，就像我提到过的，这些叶子的排列在底部形成了一个容器或者碗，
so that its rainwater collects on the leaves it rolls down into the bowl where it can be stored.
所以叶子上凝聚的雨水就会滚进“碗”里，然后被储藏起来。
OK, so its unique shape helps it gather and store water. It also helps to gather other nutrients.
所以，美叶光萼荷独特的外形有助于它收集并储藏水分，也有助于收集其他养分。
This is because insects, dead leaves from other plants or other debris land on the leaves and then get washed down into the stored water.
这是因为，当其他植物的枯叶或者别的碎屑落在叶子上时，会被冲刷进储藏的水里。
Gradually they decompose. The chemical break-down creates a nitrogen-rich food source in the stored water.
它们渐渐地就会分解。而分解后的化学物质会在储藏的水中制造出一种富含氮气的食物来源。