Operational research
出国 Abroad[经] 运筹学
🧩 词语组成解析
research
['risɝtʃ]
n. 研究，追究;探讨，探测;调查;探索;
vi. 做研究;探究;（从市场调研中）得出所预测的结果;
vt. 从事…的研究，为…而做研究;
re(again)+search(to go round)→研究；调查
🗣️ 情景例句
Have you ever been to a buffet dinner?
你去吃过自助餐吗？
His visit was well timed.
他的访问正合时宜。
I've been dying to see you.
我非常想见到你。