R&d
abbr. Research and Development 研究与开发
🗣️ 情景例句
I started traveling twenty-four hours ago.
从出门到现在已经二十四小时了。
My hobby is collecting butterfiles.
我的嗜好是收集蝴蝶。
The child learning to see, first distinguishes only two-dimensional shape;
正在学看东西的儿童起初只会分辨二维形态，