Matter is made of atoms and molecules. /'ætəm/ /ˈmɒlɪkju:ls/
(be made of由…构成，由…制成→eg: The desk is made of wood.)
(be made of VS be made from)→
（be made of:看得出原材料，制作仅发生物理变化）→These desks are made of wood.
（be made from: 看不出原材料，制作过程中发生化学变化）→The paper is made from wood.
Water, for example is the H2O molecule.
This means that a molecule of water has 3 atoms.
A water molecule has 2 hydrogen atoms and one oxygen atom. /'haɪdrədʒən/ /'ɑksɪdʒən/
Substances like sugar have many atoms in their molecules. /'sʌbstəns/
（substance和matter都是物质的意思，但substance是可数名词，而matter是不可数名词）
（这里的like=such as,例如）
A molecule of sugar has many atoms, including carbon, hydrogen and oxygen. /'kɑrbən/
（low carbon低碳）
物质由原子和分子组成。
例如水是由水分子构成的。
这意味着水分子有3个原子。
水分子有两个氢原子和一个氧原子。
像糖这样的物质分子中有许多原子。
糖分子有许多原子，包括碳、氢和氧。
Matter is made of molecules, such as H2O, which is the water molecule.
Matter can be in one of three states: solid, liquid or gas. /'sɑlɪd/ /'lɪkwɪd/
Water and ice are the same substance, but they are in different states.
These states depend on the temperature of the molecules. /ˈtemprətʃə(r)/
When we heat a substance, the molecules move faster and try to take up more space.
（try to do sth试着/设法做某事） （take up占据）
When we cool a substance, the molecules move more slowly.
When we cool a substance to its freezing point, it becomes a solid.
（freezing point冰点）（ boiling point沸点）
物质是由分子组成的，比如水分子H2O。
物质有三种状态:固态、液态或气态。
水和冰是同一种物质，但它们处于不同的状态。
这些状态取决于分子的温度。
当我们加热一种物质时，分子运动得更快，并试图占据更多的空间。
当我们冷却一种物质时，分子运动得更慢。
当我们把一种物质冷却到它的冰点时，它就变成了固体。
In a solid, the molecules move very little.
Their positions are almost fixed. /fɪkst/
To be fixed means that their positions don't change.
If we heat the molecules, they move faster and away from each other.
The solid begins to melt, like ice cream on a hot day.
在固体中，分子很少运动。
他们的位置几乎是固定的。
固定意味着他们的位置不变。
如果我们加热分子，它们就会运动得更快，远离彼此。
固体开始融化，就像在炎热的日子里吃冰淇淋一样。
At a certain temperature, a solid begins to change into a liquid.
（change sth. into sth.把…变成…）
The temperature (at which a solid changes into a liquid )depends on the substance.
句子主干是:the temperature(主语) depends on(谓语) the substance（宾语）.
括号里的是定语从句，都是用来修饰先行词the temperature，
For water, the solid begins to change into a liquid when its temperature rises to above 0 degrees Celsius.
（rise to：上升到）
For some substances, such as steel, the temperature at which it becomes a liquid is much higher.
Steel often melts at around 1370 degrees Celsius. /melt/
（表示在几度要用介词at）
在一定的温度下，固体开始变成液体。
固体变成液体的温度取决于这种物质本身。
对于水，当它的温度上升到0摄氏度以上时，固体开始变成液体。
对于某些物质，如钢，它变成液体的温度要高得多。
钢通常在1370摄氏度左右熔化。
If we continue to heat a liquid, the molecules move even faster.
（continue to do:继续做某事）
At a certain temperature, the liquid begins to change into a gas.
For water, the liquid begins to change into a gas at 100 degrees Celsius. /'sɛlsɪəs/
That is the boiling point of water.
如果我们继续加热液体，分子运动得更快。
在一定的温度下，液体开始变成气体。
对于水，液体在100摄氏度时开始变成气体。
这是水的沸点.
Inside a star, such as our Sun, the temperature is very high.
（inside:在…里面）
Everything inside the Sun is a gas.
（inside the Sun在太阳内部 VS in the Sun在太阳下）
According to scientists, there are over 65 elements inside the Sun. /'ɛləmənt/
（according to根据）（scientist科学家；science科学）（over=more than）
These include oxygen and iron.
Over 90 percent of the Sun is hydrogen gas.
在恒星内部，比如我们的太阳，温度非常高。
太阳内部的一切都是气体。
据科学家说，太阳内部有超过65种元素。
其中包括氧气和铁。
太阳的90%以上是氢气。
