北师版（2019）必修第二册Unit 5 Humans and nature Viewing workshop课件(共33张PPT)

(共33张PPT)
5
I
N
U
T
Humans and Nature
A SEA STORY①
Lesson 1
Lead in
Part ONE
Lead in
Do you know the word —“universe”
“Universe”—a world or an area of space that is different from the one we are in
Lead in
Let’s imagine how big is the “universe”.
Lead in
....
....
....
....
Lead in
Let’s watch the video and find the right answer.
Then complete the following quiz.
A. 13.8 billion B. 27.5 billion C. 46 billion D. 93 billion
1 The universe is about _________________ years old.
2 The observable universe is about _________________ light years across in diameter.
3 Today the distant objects like stars that we can observe are a bit more than _________________ light years away.
Lead in
Lead in
Have a try!
A. 13.8 billion B. 27.5 billion C. 46 billion D. 93 billion
1 The universe is about _________________ years old.
2 The observable universe is about _________________ light years across in diameter.
3 Today the distant objects like stars that we can observe are a bit more than _________________ light years away.
A
D
C
Lead in
View and learn
Part tWO
View and learn
Let’s fill in the blanks according to the rest of the video.
Questions Observable Universe Whole Universe
1 How big is it 2 Is there an edge 3 Is there a centre 4 Is it getting bigger _______________________ _______________________ _______________________ _______________________ _______________________
_______________________
_______________________
_______________________
Before watching, you can read the questions carefully.
View and learn
Now it is your turn to fill in the blanks.
Questions Observable Universe Whole Universe
1 How big is it 2 Is there an edge 3 Is there a centre 4 Is it getting bigger _______________________ _______________________ _______________________ _______________________ _______________________
_______________________
_______________________
_______________________
About 93 billion light years across in diameter.
Infinite.
Yes.
No.
Yes. Earth/You
No.
Yes.
Yes.
View and learn
Watch the video again and then discuss the following questions.
1 What is the Earth compared to Is the comparison useful in understanding the infiniteness of the universe
2 What methods does the presenter use to enable viewers to understand this piece of knowledge in physics
View and learn
View and learn
Discuss the questions with your partners.
View and learn
Useful expressions
Part three
Useful expressions
More specifically, the observable universe is the region of space visible to us from Earth.
specifically adv. 明确地
more specifically 更具体地说
observable = observe + able 能看得到的
region n. 区域; (通常界限不明的)地区; 地方; 行政区
..., then regardless of what direction we look, we see light that has been travelling at most 13.8 billion years...
regardless of 不管、不顾，后面常接名词或从句，一般用于客观上无法避免的事实，往往是不利的条件，需要主语去正面对待。
We will continue the race, regardless of the weather.
I tell the truth, regardless of what they want to hear.
Useful expressions
...so it is logical to think of the observable universe must then be two times 13.77 equals 27.5 billion light years across.
think of 考虑
equal adj. 相同的，同样的
on equal terms 平等相处
equal in的意思是“在…方面相等或平等”;
equal to 和equal with则表示“等于”;
equal to强调“相等”, equal with强调“平等”
Useful expressions
..., the size of the Earth within the observable universe is roughly equivalent to the size of a virus within the solar system.
the size of ...的尺寸
equivalent adj. 相等的；相同的
equivalent weight 当量
equivalent force 等效力
solar system 太阳系
Useful expressions
... because we cannot really appreciate the incomprehensible smallness of a virus nor the bewildering bigness of our solar system either.
appreciate doing 感谢做...
incomprehensible = in + comprehensible 无法理解的
bewildering adj. 令人困惑的
= confusing
Useful expressions
So let’s just say that the observable universe is stupendously big.
stupendously adv. 巨大地
discover stupendously 了不起地发现
waste stupendously 惊人地浪费
increase stupendously 惊人地增长
Useful expressions
But the whole universe, as far as we can tell, is a lot bigger.
as far as 只要；直到... 为止
Useful expressions
Space is most likely infinite, or at least it doesn’t have an edge.
infinite adj. 极大的；无法衡量的
at least 至少
at most 至多
Useful expressions
The whole universe is probably infinite.
probably adv. 可能；大概
probably 用法：主要修饰谓语动词,在句子里如果有一个助动词和一个主要动词, probably应紧跟在助动词之后; 如果有两个以上助动词, probably放在第一个助动词之后。
That hotel probably costs no less than 20 dollars a night.
Useful expressions
... and the whole universe has a temporal edge or what we call a beginning, but almost certainly not a spatial one.
temporal adj. 颞的
temporal edge 颞缘
spatial adj. 空间的
Useful expressions
We are at the center of the observable universe because the observable univers is just a region of space visible from Earth.
at the center of 在……的中心
Useful expressions
In fact, if you want to be more precise, each one of us is the center of our own observable universe,...
in face事实上
= actually
each one of us 我们中的每个人，作主语时，谓语动词用单数。
Useful expressions
Yes, space is expanding, which makes both the observable universe and the whole universe bigger.
非限制性定语从句
空间在膨胀，这使得可观测的宇宙和整个宇宙都变大了。
Useful expressions
Part four
Homework
Homework
Recite the key expressions and sentences.
Let’s find more information online and share with the class.