R&d
abbr. Research and Development 研究与开发
🗣️ 情景例句
I don't know what I would do without you.
我真不知道没有你们我怎么办。
Do in Rome as the Romans do.
入乡随俗。
You always want the best,but we can't afford it.Sometimes you think you're a millionaire!
你总是要买最好的，可我们买不起，有时候你认为自己是个百万富翁！