Solid, liquid, gas
固体液体气体
All things are made of matter.
万物都是由物质构成的。
Matter has three forms.
物质有三种形式。
They are solid, liquid, and gas.
它们是固体、液体和气体。
A solid is matter with its own shape.
固体是有自己形状的物质。
A rock and a book are solids.
一块石头和一本书是固体。
Even if we move a solid, it keeps its shape.
即使我们移动一个固体，它也保持它的形状。
A liquid is matter that flows.
液体是流动的物质。
Water and oil are liquids.
水和油是液体。
A liquid does not have its own shape.
液体没有自己的形状。
A liquid takes the shape of its container.
液体具有容器的形状。
A gas is matter that does not have its own shape like a liquid.
气体是不像液体那样有自己形状的物质。
A gas spreads to fill all the space of its container.
气体扩散到容器的所有空间。
When you blow up a balloon, the air spreads and fills all the space of it.
当你吹气球时，空气扩散并充满它的所有空间。
Matter can change forms.
物质可以改变形式。
Freeze a liquid, and it changes to a solid.
冷冻液体，它就变成固体。
If you freeze water, it changes to ice.
如果你把水冷冻起来，它就会变成冰。
Melt a solid, and it changes to a liquid.
熔化固体，它就会变成液体。
An ice cream melts in the hot weather.
冰淇淋在炎热的天气里会融化。
Boil water, and it changes to a vapor.
把水烧开，水就变成了蒸汽。