1.
All changes of matter fall into two broad classes:physical and chemical changes.
物质变化分为两大类：物理变化和化学变化。
2.
Can you tell a physical change from a chemical one?
你能辩别物理变化和化学变化吗？
3.
These are physical changes while those are chemical changes.
这些是物理变化而那些是化学变化。
4.
This is a chemical change, not a physical one.
这是一个化学变化，而不是物理变化。
5.
Physicals changes have nothing in common with chemical changes
物理变化和化学变化没有共同之处。
6.
This change of state is a physical change and not a chemical one.
这种状态的变化是物理变化，而不是化学变化。
7.
The breaking of the bottle is a physical change.
瓶子破裂是物理变化。
8.
The changes in matter which we see all around us are of two types, physical and chemical.
我们周围所看到的物质变化有两种：物理变化和化学变化。
9.
We have seen many chemical changes, from which physical changes are different.
我们见过许多化学变化，它们和物理变化不同。
10.
In the case of a physical change no new substance is found.
就物理变化来说，不会发现新物质。
11.
In the case of a physical change no new substance is formed.
就物理变化来说，没有新的物质产生。
12.
In the case of physical change,no new substance is formed.
就物理变化来说，没有新的物质产生 。
13.
(physics) the maintenance of a certain quantities unchanged during chemical reactions or physical transformations.
（物理学）在化学反应或物理变化中，数量不变的原则。
14.
As is mentioned above, substances are constantly undergoing physical and chemical changes .
如上所述，物质总是在进行着物理变化和化学变化。
15.
(physics) a rate of change of velocity.
（物理）周转变化速率。
16.
the physical influence that produces a change in a physical quantity.
使一个物理量产生变化的物理影响。
17.
First thing is the mental change, the next thing is the physical change.
首先是心理上的变化，然后是物理上的变化。
18.
(chemistry, physics, biology) resistant to change.
（化学、物理学、生物学）难以改变的。