导图社区 Use of materials
如何学习资料？不同的材料有不同的性能，在选择材料时，也需要考虑它的优缺点，有需要的小伙伴可以看看哦~
记叙文是以记人、叙事、写景、状物为主，以写人物的经历和事物发展变化为主要内容的一种文体形式。
表示名词、代词等与句中其它词的关系，在句中不能单独作句子成分。介词后面一般有名词、代词或相当于名词的其他词类、短语或从句作它的宾语，表示与其他成分的关系。
1. nasal cavity and mouth are connected、2. we often taste and smell the same particles、If you cover your nose, you won't be able to taste well。
社区模板帮助中心，点此进入>>
论语孔子简单思维导图
《傅雷家书》思维导图
《童年》读书笔记
《茶馆》思维导图
《朝花夕拾》篇目思维导图
《昆虫记》思维导图
《安徒生童话》思维导图
《鲁滨逊漂流记》读书笔记
《这样读书就够了》读书笔记
妈妈必读：一张0-1岁孩子认知发展的精确时间表
Use of materials
How to study materials?
Different materials have different properties
used for different things
When choosing a material, need to consider its weakness
A weakness of a material is something bad about it
Example 1
wood property
hard
strong
waterproof
Perfect materials for
house
p
boat
wood weakness
flammable
can rot
Example 2
glass property
transparent
can take many shapes
can use as
glass weakness
easy to break
dangerous
Example 3
Plastic
Scientists can change plastic's properties
hard plastic
soft plastic
any shape
Very useful!
can find plastic in many things
comes from oil
Who to study?
Materials scientists
Study to learn how to use
Why study materials?
Learn new and unique ways to use things around us
History of materials
In ancient times, people did not know the different properties of materials
It took long time to learn how to use materials
History example 1
use for clothing
past
animal skins
now
cotton
History example 2
use to write
cave painting on the wall
write in stone
write in animal bones
paper
Making paper is difficult
First you need to mix wood with water to make pulp
Then the pulp is flattened into sheets and dried to make sheets of paper.
History example 3
use to live in
weak wooden house
strong warm building
History example 4
use to keep warm
set fire
ground heating system
History example 5
use to write homework
write on paper/ in laptop
Properties of materials
A Property(特性) Describes what a Material is Like
Sensing Properties
We can use our senses to see, touch, and smell properties of materials
