Ufos
abbr. 不明飞行物（Unidentified Flying Objects）
🗣️ 情景例句
I know it!
我知道！
Theings past cannot be recalled.
过去的事情无可挽回。
This decline in vigour with the passing of time is called ageing.
生命力随时间的流失而衰退叫做衰老。