R&d
abbr. Research and Development 研究与开发
🗣️ 情景例句
He has had various experiences in his life.
他的生活经验丰富。
Who is it? Come down.
是谁？下来。
At the same time, a number of teenagers climbed on to the dish and held a little party of their own.
就在这个时候，许多十几岁的孩子爬盘子举行他们自己的集会。他们跳起了舞，盘子难以承受。