Ost
abbr. 科学技术局（Office of Science and Technology）
🗣️ 情景例句
And the telephone number is five five five…three oh nine oh. Thank you.
电话是555-3090。谢谢。
May I ask you how old you are?
我能问你多大了吗？
It is no use starting late in life to say:
年老的时候说