【Dictation】SSS 20120525

一个人的战争其实是最可怕的，永远没有硝烟和鲜花，只有泪水。你够强，就超越了自己，带领其他人一起前进。稍有不慎，可能是独自掉落深渊，谁也不能帮你，谁都拉不了你。

有时候碰到志同道合的朋友是非常幸运的。他可能已经提前走了一段，你能看到他路径上踩过的陷阱，可以避免自己再次掉落。他也可能还在你后面，而你顺手拉他一把，自己就能开心好半天。

最欣喜的是你们都同在一个频道上，能够相互鼓励，一起加油，朝着共同的目标奋进。

第二天开始了，那就别停下来。

方法论：

　　1.第一遍盲听，大概了解什么意思。

　　2.第二遍再听，尽量做到能复述出大致内容。

　　3.第三遍精听，对照原文来听。

　　4.第四遍看答案，看解释，查字典，弄懂意思。

　　5.第五遍跟读，开始是跟读，最好练到能脱稿跟着说。

知识点：

• 一个单词

dem·on·strate
 /ˈdɛmənˌstreıt/  verb  , -strates, -strat·ed, -strat·ing
  1 [  + obj  ]
  1 a : to prove (something) by showing examples of it : to show evidence of (something)
   Each student must demonstrate mastery of the subject matter in order to pass the class.
   Employees must demonstrate competence in certain skills before they can work independently.
   The medication will not be marketed until it is demonstrated to be safe.
  1 b : to prove (something) by being an example of it : to be evidence of (something)
   The town's crowded classrooms demonstrate [=point to] the need for more schools in the area.
   The latest test results clearly demonstrate that the vaccine works.
   The group's failed efforts demonstrate how difficult it is to convince people to change their habits.
  2 [  + obj  ] : to show (a quality, feeling, etc.) clearly to other people
   They have demonstrated a willingness to negotiate.
  3 [  + obj  ] : to show or explain how something is used or done : to show or explain the function or use of (something)
   Several people will be demonstrating traditional farming techniques.
   The instructor demonstrated the correct procedure for pruning a tree.
   Would you mind demonstrating how the machine works?
  4 [  no obj  ] : to take part in an event in which people gather together in order to show that they support or oppose something or someone
   A large crowd was demonstrating [=protesting] downtown.
   Protesters demonstrated against the war. 

• 听错的地方

cephalopds
their
cuttlefish（单复同形）
produce
million
Analysis 
revealed
melanin
dark
makeup
leaving
sturdy
resists
fate
these
researchers
functions
finding
leaves
ain't

听写原文：

Cuttlefish Use Ancient Ink Formula

The melanin in modern-day cuttlefish ink is nearly chemically identical to the pigment found in ancient cephalopods' fossilized ink sacs. Sophie Bushwick reports

May 25, 2012 

Tens of millions of years ago, cephalopods were hiding from their enemies in clouds of ink. And it turns out that cuttlefish today produce ink that’s almost identical.

Researchers found fossils of two giant cephalopods that swam the seas more than 160 million years ago. Each one contained a preserved ink sac. Analysis of the sacs revealed that some melanin pigment—the stuff that makes the ink dark—had survived. Plus, the chemical makeup of the melanin was virtually the same as the pigment found in modern-day cuttlefish ink. The work is in the Proceedings of the National Academy of Sciences. [Keely Glass et al., "Direct chemical evidence for eumelanin pigment from the Jurassic period"]

It’s rare to find preserved soft tissue in the fossil record. In addition, biomolecules often break down, leaving none of the original organic compounds. Melanin, however, has a sturdy structure that resists this fate. And the methods these researchers used to isolate it from the fossils could help other paleontologists better identify preserved organic molecules and their functions.

The finding also demonstrates that when something works, evolution usually leaves it alone. Because if it ain’t broke, don’t fix it.

—Sophie Bushwick

[The above text is a transcript of this podcast.]