R&d
abbr. Research and Development 研究与开发
🗣️ 情景例句
Have you made the reservations for...
你为。。。订了座吗？
There is much to be said on both sides.
公说公有理，婆说婆有理。
But if you are a serious private investor,
但是，如果你是一个认真的私人投资者，