1. second-hand

adj. 二手的;用过的;旧的

e.g. I often buy second-hand clothes online to save money. 

e.g. The website specializes in second-hand goods.

adj. (故事、观点、信息)第二手的，间接的，非亲身经历的

e.g. I only know this from second-hand information, so I can't be sure it's true.

adv. 以间接/二手的方式；

搭配：buy/ get something second-hand

搭配：experience something second-hand

e.g. She buys all her clothes second-hand.

e.g. He experienced the trauma second-hand through his partner's stories.

2. refurbished /rɪˈfɚbɪʃt/

adj. 翻新的

e.g. I recently bought a refurbished smartphone online. It was much cheaper than a new one, but it works just as well.

e.g. Buying refurbished phones helps reduce electronic waste, which is a serious environmental issue nowadays.

e.g. Refurbished phones are usually much cheaper than brand-new ones.

补充：brand-new 全新的

其他不同的产品新旧度：

like new 几乎全新的

gently/ slightly used 轻微使用过的

heavily used 使用频繁的

worn 磨损的

3. wear /weə/

v. 磨损;用旧；

搭配：wear out  磨损;用坏

wear thin 变薄/用旧

e.g. Even well-maintained devices will eventually wear out due to constant use.

e.g. The fabric on this jacket is starting to wear thin.

4. hand-me-downs

n. 二手的；别人用过的[尤用于服装]

e.g. When I was a child, most of my clothes were hand-me-downs from my older sister.

e.g. Some people feel embarrassed wearing hand-me-downs, but I think it’s practical and eco-friendly.