mystery n.神秘的事物; 不可理解之事; 奥秘;
There are many mysteries in nature.
Mysteries are things we don't understand ,such as how the Egyptian pyramids were built.
In fact,we are surrounded by mysteries.
What we know about the world seems like very little.
(Things we don't understand are mysteries.)
pyramids n.(古埃及的) 金字塔; 锥体; 棱锥体; 金字塔形的物体(或一堆东西);
Egyptian pyramids 网络埃及金字塔;
Egyptian n.埃及人; 古埃及人; adj.埃及的; 埃及人的; 埃及语的;
a little和a few都指的是少量、少许、一点点,表肯定.但前者修饰不可数名词,后者修饰可数名词.
very litttle和very few都表示很少、几乎没有,表否定.同样,前者修饰不可数名词,后者修饰可数名词.
Scientists tell us that what we see in the universe is only a small part of what is there.
The rest is invisible, including dark matter and dark energy.
These two unknowns make up around 95% of the universe.
Evidence for their existence comes from their effects on what we can observe, such as the motion and positions of distant galaxies.
(Most of what makes up the universe is invisible.)构成宇宙的大部分东西是看不见的
(The rest is invisible, including dark matter and dark energy.)
rest n.剩余部分; 残留; 其余; 其余的人; 其他事物; 其他; 休息时间; 睡眠时间
invisible adj.看不见的; 隐形的; 无形的(与服务而非商品有关);
dark matter n.暗物质(根据一些理论，指太空中不发光的物质); n.暗物质(根据一些理论，指太空中不发光的物质);
dark energy 网络暗能量; 黑暗能量; 暗能; 暗物质; 隐秘能量;
unknown n.未知的地方(或事物); 无名者; 不出名的人; 不明的情况; 未知的因素;
effect n.效应; 影响; 结果; (艺术家或作家所要创造的特定) 外观，声响，印象，效果; (个人) 财产，所有物，财物;
the motion and positions 运动和位置
positins 用复数可以表示遥远星系的方位比较多
Yet though we know very little, we are able to build airplanes and communicate with smartphones.
In some ways ,we humans are very smart , or at least we think we are.
We still need to face big issues, like climate change,and that is going to be a huge challenge.
The challenge for humans will be our ability to adapt to our changing environment.
人类面临的挑战将是我们适应不断变化的环境的能力
(What is the example of big issue?)
Yet conj.但是; 然而;
we humans 同位语，即we和humans相互复指。我们人类。
adapt to 适应;
What about other forms of life?
How do they adapt? 他们怎么适应？
Seasonal variations, for example, can be one of the greatest challenges for animals to overcome.
Overcoming such challenges is a great achievement but hardly easy.
Some birds migrate thousands of kilometers each year to seasonal changes.
These migrations are amazing.
(Why do birds migrate?) to do with seasonal changes.
adapt v.使适应，使适合(新用途、新情况); 适应(新情况); 改编; 改写;
Seasonal adj.季节性的; 随季节变化的; 节令性的; 适应节日需要的; (尤指) 圣诞节的;
variation n.(数量、水平等的) 变化，变更，变异; 变异的东西; 变种; 变体; 变奏; 变奏曲;
hardly adv.几乎不; 几乎没有; 尤用于can或could之后，主要动词之前，强调做某事很难; 刚刚; 才;
deal with [词典]处理; 应付; 与…打交道; 克制（不快情感）;
migrate v.(随季节变化) 迁徙; 移居; 迁移; 移动; 转移;
amazing adj.令人大为惊奇的; (尤指) 令人惊喜(或惊羡、惊叹)的;
Birds don't carry maps or compasses, yet they know where to go.
They have developed the ability to see the earth‘'s magnetic field.
This ability is a wonder of nature.
It takes the advantage of the fact that the earth is like a huge bar magnet.
It has a north pole which is positive, and a south pole which is negative.
Somehow the birds are able to see this magnetic field and use it to their advantage.
(What ability do birds have to help their navigate?)
map n.地图;
compass n.罗盘; 罗经; 指南针; 罗盘仪; 圆规; 两脚规; 范围; 范畴; 界限;
magnetic adj.像磁铁的; 有磁性的; 磁的; 磁性的; 富有吸引力的; 有魅力的;
magnetic field 磁场
wonder n.惊讶; 惊奇; 惊异; 惊叹; 奇迹; 奇观; 奇事;
advantage n.有利条件; 有利因素; 优势; 优点; (局末平分后) 占先; 优势分;
It takes the advantage of 利用
magnet n.磁铁; 磁石; 吸铁石; 有吸引力的人(或地方、事物); 磁体; 磁性物体
Somehow adv.以某种方式(或方法); 由于某种未知的原因; 不知为什么; 不知怎么地;
navigate v.导航; 确定(船、飞机、汽车等)的位置和方向; 航行; 航海; 横渡
And even the way birds fly together is amazing.
Many migrating birds fly in a V formation.
They do this to conserve energy.
In a V formation,birds can use the energy of the birds in front of them.
This energy comes from the air currents generated by the wings.
Conserving energy is necessary for the birds to survive the long journey.
How do the birds know this?
It's truly amazing how the birds know this.
formation n.组成; 形成; 组成物; 形成物; 编队; 队形;
current n.(海洋或江河的) 水流; 气流; 电流; 思潮; 潮流; 趋向;
air currents 网络 气流;
wing n.(鸟、昆虫或蝙蝠) 翅膀，翼; (飞行器的) 翅膀; 机翼
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