Concepts
n. 概念, 观念；思想（concept复数形式）
🗣️ 情景例句
Oh! I just drop in on him for a chat.
哦，我只是顺便来和他聊聊天。
Don't forget to put stamps on your letter.
别忘了贴邮票。
Thank you, sir.
谢谢您，先生。