Matter can be used as both a noun and a verb in English with multiple meanings:
As a noun:
1. Physical substance in general
2. A subject or situation under consideration
3. Importance or significance
4. A problem or difficulty
5. Written material
As a verb:
1. To be of importance
2. To form or discharge pus (medical term)
Matter这个词儿可老有意思了，能当名词也能当动词使：
当名词时候：
1. 指"物质"这玩意儿，比如"dark matter"就是暗物质
2. 表示"事情、问题"，比如"What's the matter?"就是"咋回事儿啊？"
3. 说"重要性"，"It's a matter of life and death"就是"这可是生死攸关的大事"
4. 指"麻烦事儿"，"There's a matter I need to discuss"就是"有个破事儿得唠唠"
5. 书面材料，比如"printed matter"就是印刷品
当动词时候：
1. 表示"要紧、重要"，"It doesn't matter"就是"这都不是事儿"
2. 医学术语"化脓"，这个一般人用不上，知道就得
补充说明：老外常说"No matter what"就是"不管咋地"，"as a matter of fact"就是"说实话"，这些固定搭配可得记牢喽！