【学习笔记】懂你英语 核心课 Level 5 Unit 1 Part 4（I）Listening Mysteries of Nature 1
There are many mysteries in nature.
自然界中有许多的奥秘。
Mysteries are things we don't understand, such as how the Egyptian pyramids were built.【填空】【朗读】
奥秘是我们所不理解的事物，例如金字塔是如何建造的。
In fact, we are surrounded by mysteries.
事实上，我们被未解之谜所包围。
What we know about the world seems like very little.【跟读】
我们对世界所知甚少。
【选择】Things we don't understand are... mysteries.
Scientists tell us that what we see in the universe is only a small part of what is there.
科学家告诉我们，我们所见的只是宇宙的一小部分。
The rest is invisible, including dark matter and dark energy.【填空】【跟读】
其余的是看不见的，包括暗物质和暗能量。
These two unknowns make up around 95% of the universe.
这两种未知领域大约组成了宇宙的95%。
Evidence for their existence comes from their effects on what we can observe, such as the motion and positions of distant galaxies.【填空】
它们存在的证据来自于它们对我们所能观察到的事物的影响，例如遥远星系的运动和位置。
Yet, though we know very little, we are able to build airplanes and communicate with smartphones.
然而，尽管我们最所知甚少，我们还是能够制造飞机并且通过智能手机互相交流。
In some ways we humans are very smart, or at least we think we are.【跟读】
在某些方面人类很聪明，或者至少我们认为自己很聪明。
We still need to face big issues, like climate change, and that is going to be a huge challenge.
但是我们仍然需要面对重大问题，例如气候变化，这将是一个巨大的挑战。
The challenge for humans will be our ability to adapt to our changing environment.【填空】【朗读】
人类面临的挑战将是我们适应不断变化的环境的能力。
【选择】-What's an example of big issue? -global warming.
What about other forms of life?
其他形式的生命呢？
How do they adapt?
它们如何适应的？
Seasonal variations, for example, can be one of the greatest challenges for animals to overcome.
季节变化，举个例子，可能是动物需要克服的最大挑战之一。
Overcoming such challenges is a great achievement, but hardly easy.【填空】
克服这些挑战是伟大的成就，但是绝非易事。
Some birds migrate thousands of kilometers each year to deal with seasonal changes.
有些鸟每年迁徙数千公里来应对季节的变化。
These migrations are amazing.
这些迁徙是惊人的。
Birds don't carry maps or compasses, yet they know where to go.【跟读】
鸟类不携带地图或者罗盘，但是它们知道去哪里。
They have developed the ability to see the Earth's magnetic field.
它们发展出了观察地球磁场的能力。
This ability is a wonder of nature.
这项能力堪称大自然的奇迹。
It takes advantage of the fact that the earth is like a huge bar magnet.【朗读】
它们利用了地球就像一个巨大条形磁铁的事实。
It has a north pole, which is positive, and a south pole, which is negative.
北极是正极，南极是负极。
Somehow the birds are able to see this magnetic field and use it to their advantage.
不知如何地，鸟类能够看到并利用这个磁场。
【选择】-How do birds know where to fly? -They use the Earth's magnetic field.
And even the way birds fly together is amazing.【跟读】
甚至鸟类一起飞行的方法也令人惊叹。
Many migrating birds fly in a V formation.
许多候鸟呈V字形排列飞行。
They do this to conserve energy.
它们这样做是为了保持能量。
In a V formation, birds can use the energy of the birds in front of them.【朗读】
以V字形飞行，鸟类可以利用前面鸟的能量。
This energy comes from the air currents generated by the wings. 【跟读】
这种能量来源于翅膀产生的气流。
Conserving energy is necessary for the birds to survive the long journey.【填空】【跟读】
保持能量在鸟类的长途飞行中是必需的。
How do the birds know this?
鸟类是如何知道的呢？
It's truly amazing how the birds know this.
鸟类是如何知道的真是令人惊讶。
【选择】-Why do birds fly in a V formation? -to conserve energy.
