R and d program
[经] 研究与发展, 开发规划
🧩 词语组成解析
and
[ənd, ən,ænd]
conj. 和，与;而且;于是，然后;因此;
🗣️ 情景例句
I want our children to learn
我要孩子们学习到
I met one of the cameramen over at the television station.
我在电视公司遇到一位摄影师。
and that their rims are clean and dry.
瓶口清洁干燥。