先理解核心含义，再看它在真实句子里的用法。
以二手方式；通过购买二手物品的方式
if you buy something second-hand, it has been owned and used by someone else before you
I bought this book second-hand.
我二手买了这本书。
用法提示：second-hand 作副词，修饰动词 bought，表示购买方式为二手。
She prefers to buy clothes second-hand to save money.
她更喜欢二手买衣服以省钱。
用法提示：second-hand 作副词，修饰动词 buy，表示购买方式。
He got his furniture second-hand from an online marketplace.
他从网上二手市场买了家具。
用法提示：second-hand 作副词，修饰动词 got，表示获取方式为二手。
She bought a laptop second-hand.
她以二手方式买了一台笔记本电脑。
He got the furniture second-hand from a neighbor.
他从邻居那里以二手方式得到了这些家具。
They purchased the car second-hand.
他们以二手方式购买了这辆车。
grammar · medium
易错句子I bought the book second hand.
正确表达I bought the book second-hand.
作为副词使用时，需要连字符连接 'second-hand'，不能写成两个分开的词。连字符表示这是一个复合副词，修饰动词的方式。
grammar · medium
易错句子I bought the car from second-hand.
正确表达I bought the car second-hand.
副词 'second-hand' 直接修饰动词，不需要介词。中文学习者容易受到介词结构的影响，但英语中副词可以直接修饰动词表示方式。
second-hand 是副词，修饰动词，表示“以二手方式”；而 used 是形容词，修饰名词，表示“二手的”。例如：I bought a used car.（我买了一辆二手车。）
second-hand 是中性副词，而 pre-owned 是更正式的形容词，常用于商业语境。
second-hand 表示“通过他人（得到信息）”，而 indirectly 强调不直接，但可能不涉及他人。
买二手的；以二手方式购买
We bought our sofa second-hand.
我们的沙发是买二手的。
卖二手的；以二手方式出售
She sells children's clothes second-hand online.
她在网上卖二手童装。
间接听说某事
I only heard about the accident second-hand.
那场事故我只是间接听说的。
间接得知某事
We learned the news second-hand from a neighbor.
这个消息我们是从邻居那里间接得知的。
二手弄到某物；从别人手里得到
He got the guitar second-hand from a friend.
这把吉他他是从朋友那里二手弄到的。
adjective
Choose the next layer that will help you use second-hand with more confidence.
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