Deng
abbr. 工程学博士（Doctor of Engineering）
🗣️ 情景例句
You have been working on this for some time, Richard.
你从事这工作已有一段时间了， Richard。
Open your book,please.
请把书打开。
Excuse me. Is there a post office near here?
请问，附近有邮局吗？