Osts
(ost 的复数) abbr. 科学技术局（Office of Science and Technology）
🗣️ 情景例句
Gemma, sit. Gemma
Gemma,坐,Gemma,
Please try it.
请试试看。
It was my first flight. I was nervous when the plane took off.
我第一次坐飞机，起飞时我有点紧张。