a solid
指某一种固态物质时，solid 是可数名词，前面用不定冠词 a；特指时用 the solid。
At room temperature, iron is a solid.
在室温下，铁是一种固体。
固体食物；非流质食物；立体图形；三维形状；单色衣物；一种基本物质状态,能保持其大小和形状而无需容器(与液体或气体相对)；在室温和压力下呈固态的物质
solid (substance in the solid state)
一种基本物质状态,能保持其大小和形状而无需容器(与液体或气体相对)
A substance in the fundamental state of matter that retains its size and shape without need of a container (as opposed to a liquid or gas).
在室温和压力下呈固态的物质
matter that is solid at room temperature and pressure
三维立体图形(与表面、面积或曲线相对)
A three-dimensional figure (as opposed to a surface, an area, or a curve).
物质在中等压力下没有流动倾向；抵抗变形的力(如压缩)；保持固定的大小和形状
the state in which a substance has no tendency to flow under moderate stress; resists forces (such as compression) that tend to deform it; and retains a definite size and shape
单色的衣物
An article of clothing which is of a single color throughout.
三维形状
a three-dimensional shape
非液体的食物
Food which is not liquid-based.
At very low temperatures, many liquids turn into a solid.
在极低的温度下，许多液体会变成固体。
用法提示：solid 作名词，指物质的一种基本状态，与液体相对。
For health reasons, the doctor advised him to avoid solids for a day.
出于健康原因，医生建议他一天内不要吃固体食物。
用法提示：solid 用复数形式，指固体食物，与流质食物相对。
A cube is a three-dimensional solid with six equal faces.
立方体是有六个相等面的三维立体图形。
用法提示：solid 作名词，指立体图形，与平面图形相对。
指某一种固态物质时，solid 是可数名词，前面用不定冠词 a；特指时用 the solid。
At room temperature, iron is a solid.
在室温下，铁是一种固体。
复数 solids 常指固体食物，与流质食物相对。
The baby started eating solids at six months.
宝宝六个月大时开始吃固体食物。
特指某一块固体时用 the solid，后面接动词说明它发生了什么变化。
The solid melted quickly when we heated it.
我们加热时，那块固体很快就熔化了。
grammar · medium
易错句子Solid has a fixed shape and volume.
正确表达A solid has a fixed shape and volume.
solid 作可数名词，单数表示“一种固体”时，泛指要用不定冠词 a/an；汉语名词前没有冠词，学习者容易把可数名词单数裸露作主语。
grammar · medium
易错句子Babies can eat solid at six months.
正确表达Babies can eat solids at six months.
表示“固体食物”时 solid 通常用复数 solids，是固定用法；汉语“吃固体食物”没有复数标记，直接说 eat solid 就把可数名词单数裸露了，不合语法。
固体、液体和气体
The three states of matter are solid, liquid, and gas.
物质的三种状态是固体、液体和气体。
变成固体
When water freezes, it becomes a solid.
水结冰时会变成固体。
在室温下为固体
Iron is a solid at room temperature.
铁在室温下是固体。
吃固体食物
The baby is starting to eat solids.
宝宝开始吃固体食物了。
几何体
A cube is a geometric solid.
立方体是一种几何体。
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