R&d
abbr. Research and Development 研究与开发
🗣️ 情景例句
Let me give you a little fatherly advice.
让我像父亲般给你提点建议。
The world is a ladder for some to go up and others to go down.
世界好似一把梯，有人上去有人下。
This model's less expensive than that one.
这种型号比那种要便宜些。