中古

1. Origins, structure, and basic meaning

• Structure: 中古 is read as ちゅうこ and describes a used or secondhand item rather than a new one.
• Basic usage: Use 中古の机 for a used desk and 中古本を扱う for handling or selling secondhand books.

2. Common pitfalls and similar expressions

• Difference between 中古 and 新品
  • The former describes an item that has already been used, whereas the latter is a brand-new, unused product.