Ref.
abbr. 文件编号（尤用于商业文件分类）\\n
🗣️ 情景例句
Hmmm. It is wrong.
嗯嗯。是不对劲。
John has extracurricular activities. He's on the football team.
约翰有课外活动。 他参加了足球队。
Many strange new means of transport have been developed in our century,
本世纪已研制出许多新奇的交通工具，