Grenz tube
[医] 境界线管
🧩 词语组成解析
🗣️ 情景例句
What's the problem, Richard?
有什么问题吗 Richard
What were you doing when I called you on the telephone?
当我打电话给了你时，你正在做什么？
Thank you, Mr. Robert.
谢谢，罗伯特先生。