購入

1. Origins, structure, and basic meaning

• Structure: 購入 is read as こうにゅう and means a purchase or buying; it combines with する for the act of purchasing.
• Basic usage: It can describe testing options before buying or the approval required for a purchase.

2. Common pitfalls and similar expressions

• Comparing before purchase
  • 購入: Several bicycles are tried before a new one is purchased. Example: 新しい自転車を購入する前に何台か試した。
• When a purchase needs approval
  • 購入: School approval is required for the purchase of the teaching materials. Example: 教材の購入には学校の許可が必要だ。