Ost
abbr. 科学技术局（Office of Science and Technology）
🗣️ 情景例句
Will you come over to help me with the tough job?
您能否来帮助我做这项艰苦的工作？
There are only two minutes left.
只剩两分钟了。
Oh? Is there some trouble?
哦，有什么问题吗？