Osts
(ost 的复数) abbr. 科学技术局（Office of Science and Technology）
🗣️ 情景例句
Thank you, Dr. Stewart.
谢谢你，Stewart大夫。
One way or a round trip ticket?
单程票还是双程票呢？
They have to work hard to support their family.
他们必须努力工作来支持他们的家。