官網(wǎng)地址：https://material.io/guidelines/material-design/material-properties.html

Material has certain immutable characteristics and inherent behaviors.

Material擁有某些一成不變的特點和固有的行為。

Understanding these qualities of material will help you manipulate material in a way that’s consistent with the vision of material design.
理解material的這些特質(zhì)，能夠幫助你以符合material design的一貫視覺效果去使用material。

Material characteristics
Material的特點
Solid 立體
Occupies unique points in space 占用空間中的唯一點
Impenetrable 不能穿透的
Mutable shape 可變的形態(tài)
Changes in size only along its plane 只在水平方向上改變大小
Unbendable 不能彎曲的
Can join to other material 可以結合其他才是
Can separate, split, and heal 可以分離，可以拆分，也可以復原
Can be created or destroyed 可以被創(chuàng)建或者銷毀
Moves along any axis 可以沿任意軸移動

whatismaterial_materialproperties_physicalproperties_thickness_01_yes.png

Contents
Physical properties
Transforming material
Movement of material

• Physical properties 物理性能
  Material has varying x & y dimensions (measured in dp) and a uniform thickness (1dp).
  material擁有不同的x&y（以dp為單位）和一個均勻的厚度（1dp）

whatismaterial_materialproperties_physicalproperties_thickness_01_yes.png

Do.(官網(wǎng)視頻)
可變的
The height and width of material can vary.
Material的寬高是可變的。

whatismaterial_materialproperties_physicalproperties_thickness_02_no.png

Don't.（官網(wǎng)視頻）
不可變的
Material is always 1dp thick.
Material總是1dp的厚度

Material casts shadows.
Material投射陰影
Shadows result naturally from the relative elevation (z-position) between material elements.
陰影自然而然來自于Material元素之間的相對高度（z-位置）

Do.（官網(wǎng)視頻）
Shadows depict the relative elevation between material elements.
陰影描述了material元素之間的相對高度

Don't.（官網(wǎng)視頻）
Shadows are never approximated by coloring material.
陰影永遠不與material的顏色相近

Content is displayed on material, in any shape and color. Content does not add thickness to material.
在material中顯示的內(nèi)容，可以使任何形狀，任何顏色。內(nèi)容不會增加material的厚度。

Do.（官網(wǎng)視頻）
Material can display any shape and color.
Material可以展示任何形狀和顏色

Content can behave independently of the material, but is limited within the bounds of the material.
內(nèi)容可以在material的限定范圍內(nèi)獨立運作。

Do.（官網(wǎng)視頻）
Content behavior can be independent of the behavior of material.
內(nèi)容的表現(xiàn)可以獨立于material的表現(xiàn)

Material is solid.
Material是立體的
Input events cannot pass through material.
輸入事件不能通過material。

whatismaterial_properties_physical3.png

Do.（官網(wǎng)視頻）
Input events only affect the foreground material.
輸入事件僅僅影響前景material。

whatismaterial_properties_physical4.png

Don't.（官網(wǎng)視頻）
Input events cannot pass through material.
輸入事件不能通過material。

Multiple material elements cannot occupy the same point in space simultaneously.
多個material不能同時占用空間中的同一個點。

whatismaterial_properties_physical5.png

Do.（官網(wǎng)視頻）
Using elevation to separate material elements is one method of preventing multiple material elements from occupying the same point in space simultaneously.
使用高度分離material元素是防止多個material元素同時占據(jù)相同點的一種方式。

whatismaterial_properties_physical6.png

Don't.（官網(wǎng)視頻）
Multiple material elements cannot occupy the same point in space simultaneously.
多個material不能同時占用空間中的同一個點。

Material cannot pass through other material.
material 不能通過其他material。
For example, one sheet of material cannot pass through another sheet of material when changing elevation.
例如，當改變高度的時候，一個material的薄片不能通過另一個material的薄片。

Don't.（官網(wǎng)視頻）
Material cannot pass through other material.
material不能通過其他的material。

Transforming material
改變material
Material can change shape.
material可以改變形狀。

Material can change shape.
material可以改變形狀。

Material grows and shrinks only along its plane.
material僅僅沿著它所在的平面增長和收縮。

Do.（官網(wǎng)視頻）
Material grows and shrinks only along its plane.
material僅僅沿著它所在的平面增長和收縮。

Material never bends or folds.
Material從來不彎曲或者折疊。

Don't.（官網(wǎng)視頻）
Material never bends or folds.
Material從來不彎曲或者折疊。

Sheets of material can join together to become a single sheet of material.
material的片斷可以一起集合成單個material片斷。

Multiple sheets of material can join together to become a single sheet.
material的多個片斷可以一起集合成單個material片斷。

When split, material can heal. For example, if you remove a portion of material from a sheet of material, the sheet of material will become a whole sheet again.
當分裂開時，material能夠恢復如初。例如，如果從material的片斷中移除了material的一部分，material的片斷將再次變成一個完整的片斷。

Material can split and become whole again.
Material能夠裂開并且再次匯聚成一個完整的material。

Movement of material
material的移動
Material can be spontaneously generated or destroyed anywhere in the environment.
material可以在環(huán)境中的任何地方自發(fā)產(chǎn)生或者銷毀。

Material can be spontaneously generated or destroyed.
Material能夠被自發(fā)產(chǎn)生或者銷毀。

Material can move along any axis.
Material可以沿著任意軸移動。

Material can move along various axes.
Material可以沿多個軸移動。

Z-axis motion is typically a result of user interaction with material.
Z軸運動通常是用戶與material交互的結果

Z-axis motion prompted by user interaction.
Z軸運動展示了用戶的交互。