substance

柯林斯词典

1. N-COUNT A substance is a solid, powder, liquid, or gas with particular properties. 物质
There's absolutely no regulation of cigarettes to make sure that they don't include poisonous substances. 绝对没有确保香烟不含有毒物质的规定。
2. N-UNCOUNT Substance is the quality of being important or significant. 实质[正式]
It's questionable whether anything of substance has been achieved. 是否已取得任何实质性的进展值得质疑。
3. N-SING The substance of what someone says or writes is the main thing that they are trying to say. 要旨
The substance of his discussions doesn't really matter. 他讨论的要旨实际并不重要。
4. N-UNCOUNT If you say that something has no substance, you mean that it is not true. 正确性[正式]
There is no substance in any of these allegations. 这些指控没有一个是正确的。

a natural substance
This substance is so radioactive that it glows in the dark .
This substance stretches to any shape you want .
Rubber is a flexible substance.
Two days after he'd been exposed to the substance, a painful rash erupted on his neck .