R&d
abbr. Research and Development 研究与开发
🗣️ 情景例句
No problems. Here's your passport, and here's your money. Have a nice day, Mr. Lu.
没问题。这是您的护照，还有您的钱。祝您愉快，陆先生。
I'm afraid he will lose your time.
我怕他会浪费你的时间。
Once waves have been generated,
一旦波浪形成，