R&d
abbr. Research and Development 研究与开发
🗣️ 情景例句
When you go to a new school it takes a while to know the ropes.
到一所学校读书要花一段时间熟悉情况。
There is noaccounting for tastes.
人各有所好。
May I ask some questions?
我可以问几个问题吗？