原文已被隐藏，你可用 快捷键 - 或点击 显示原文 按钮来查看原文
第1段
1 .Listen to part of a lecture in a botany class.
该句暂无译文！
第2段
1 .Hi, everyone. Okay.
该句暂无译文！
2 .Today, I will lecture on some pretty strange plants.
该句暂无译文！
3 .As a matter of fact, the plants we will discuss are from the family Rafflesia, a parasitic plant.
该句暂无译文！
4 .So, without further delay, I will begin.
该句暂无译文！
5 .The Rafflesia is a genus of parasitic flowering plants.
该句暂无译文！
6 .It contains, um ...15-19 species,
该句暂无译文！
7 .all found in southeastern Asia, let's see, on the Malay Peninsula, Borneo, Sumatra, West Malaysia, and the Philippines.
该句暂无译文！
8 .The flowers have no leaves and hardly any stem,
该句暂无译文！
9 .just a huge, speckled, fivepetal flower with a diameter of up to 106 cm, and it weighs up to 10 kg.
该句暂无译文！
10 .Even the smallest species, um, R. manillana, has 15-inch-diameter flowers.
该句暂无译文！
11 .The flowers smell like rotting meat, so we get certain local names for these plants which translate to,
该句暂无译文！
12 .um, "corpse flower" or "meat flower."
该句暂无译文！
13 .The vile smell that the flower gives off can sometimes attract flies, which these plants use as a food source.
该句暂无译文！
14 .Additionally, it is parasitic on vines In the genus Vitaceae,
该句暂无译文！
15 .spreading its roots inside the vine.
该句暂无译文！
16 .Now, let's talk about specific varieties of Aafflesia.
该句暂无译文！
17 .I'll begin with the Nepenthes rafflesiana,
该句暂无译文！
18 .a species of pitcher plant named after Stamford Raffles,
该句暂无译文！
19 .the founder of Singapore.
该句暂无译文！
20 .This plant has a very wide distribution covering, um,
该句暂无译文！
21 .Borneo, Sumatra, Peninsular Malaysia, and Singapore.
该句暂无译文！
22 .N. raffle-slana is extremely variable with numerous forms and varieties.
该句暂无译文！
23 .For example, in Borneo alone,
该句暂无译文！
24 .there are at least four distinct varieties.
该句暂无译文！
25 .The most impressive form, known as N. rafflesiana gigantea, produces enormous pitchers.
该句暂无译文！
26 .These pitchers, or heavily modified ¡¤leaves,
该句暂无译文！
27 .are used to capture and kill insect prey for nutrients.
该句暂无译文！
第3段
1 .Well, like it or not, all Nepenthes are, um, passive carnivores.
该句暂无译文！
2 .They are classified passive because they have no moving parts,
该句暂无译文！
3 .unlike their distant cousins the Venus flytrap, an active carnivore.
该句暂无译文！
4 .Okay ... So the N. rafflesiana kills by luring its prey into its, ah, pitchers,
该句暂无译文！
5 .whose peristomes secrete sweet-tasting nectar.
该句暂无译文！
6 .Once the insect is inside, it quickly finds the walls of the pitcher too slippery to scale and,
该句暂无译文！
7 .as you may expect,drowns.
该句暂无译文！
8 .Digestive enzymes released by the plant into the liquid break down the prey and,
该句暂无译文！
9 .um, release soluble nutrients, which are absorbed by the plant through the walls of the pitcher.
该句暂无译文！
10 .The carnivorous nature of Nepenthes is supposedly a consequence of,
该句暂无译文！
11 .um, living in nutrient-poor soils since the main method of nutrient absorption in most plants,
该句暂无译文！
12 .the root, is insufficient in these soils, so the plants have evolved other ways to gain nutrients.
该句暂无译文！
13 .Let's see, yes, finally, N. rafflesiana enjoys hot, humid conditions most of the time,
该句暂无译文！
14 .as found in tropical jungle lowlands.
该句暂无译文！
第4段
1 .Okay, so far so good.
该句暂无译文！
2 .The next plant I will discuss is the, um ... where are my notes, ah, here we go,
该句暂无译文！
3 .Rafflesia arnoldii, another member of the genus Rafflesia.
该句暂无译文！
4 .Not only is it the world's largest flower,
该句暂无译文！
5 .but it is also one of the most bizarre and improbable organisms on the planet.
该句暂无译文！
6 .There are some plants with larger flowering organs,
该句暂无译文！
7 .for example, the Titan Arum and Talipot,
该句暂无译文！
8 .but these are technically clusters of many flowers.
该句暂无译文！
9 .Rafflesia arnoldii is the largest, and you can take this to the bank,
该句暂无译文！
10 .because its flower attains a diameter of nearly three feet and can weigh up to,
该句暂无译文！
11 .get this, 24 pounds!
该句暂无译文！
第5段
1 .It lives as a parasite on the Tetra Stigma vine,
该句暂无译文！
2 .as its host, which grows only in undisturbed rainforests.
该句暂无译文！
3 .White many parasites appear like normal plants,
该句暂无译文！
4 .um, Rafflesia lacks any observable leaves, roots, or even stems,
该句暂无译文！
5 .and this is what makes it so strange.
该句暂无译文！
6 .A lot like fungi, Rafflesia individuals grow as thread-like strands of tissue
该句暂无译文！
7 .completely embedded within and in intimate contact with surrounding host cells from which, um, nutrients and water
该句暂无译文！
8 .are obtained. The only part of Rafflesia that is identifiable as distinctly plant-like are the, ah,
该句暂无译文！
9 .flowers, although even these are bizarre because they attain a massive size and are usually reddish-brown and stink of rotting flesh.
该句暂无译文！
10 .The flower is pollinated by, uh, oh my goodness,
该句暂无译文！
11 .flies ... which are attracted by its scent.
该句暂无译文！
12 .Aafflesia arnoldii is very rare and fairly hard to locate.
该句暂无译文！
13 .It is especially difficult to see in flower because the buds take many months to develop,
该句暂无译文！
14 .and the flower lasts for just a few days.
该句暂无译文！