Ost
abbr. 科学技术局（Office of Science and Technology）
🗣️ 情景例句
He plays games with his daughter every night after work.
下班后他每晚都和他的女儿玩游戏。
What is thelargest industrial center in this country?
这个国家最大的工业区是哪里？
I decided that I must have taken a wrong turning somewhere.
我想一定是什么地方拐错了弯儿。