R&d
abbr. Research and Development 研究与开发
🗣️ 情景例句
Thank you. I'd very much like to have a cup of Chinese tea.
我想来杯中国茶，谢谢你。
Loftiest trees most dread the thunder.
树大招风。
Sally is looking at a big ship.
莎莉正在观看一艘大船。