purchase

Compared meaning: to get something by paying money (verb).

比较义项：付钱获得某物（动词）。

• buy

  The everyday, neutral word for getting something with money; used in casual speech for things big or small, and can take an indirect object (buy someone something).

  是日常、中性的用词，口语中用于购买大小事物皆可，也可带间接宾语（buy someone something，给某人买某物）。

  Can you buy some milk on your way home from work?

  你下班回家路上能买点牛奶吗？

• purchase 本词

  A formal, often written word typically used for larger or more significant items in business or official contexts; sounds stiff if used in casual everyday conversation.

  是较为正式、常用于书面语的用词，多用于商业或正式场合中较贵重或重要的物品；若用于日常口语交谈中会显得生硬。

  The company plans to purchase new equipment for the factory next year.

  公司计划明年为工厂购买新设备。

Buy and purchase both mean to get something by paying money. Buy is the everyday, neutral word used in casual speech for anything, big or small. Purchase is more formal, often written, and used for larger items in business; it sounds stiff in casual conversation.

这两个词都表示“花钱得到某物”，但语体不同：buy 是日常口语中最常用的说法，purchase 更正式、书面化，常见于商业或书面语境，口语中使用会显得生硬。