unknown
举一反三
- _____ is unknown to us all.
- What is an UFO? A: It is an Unknown Flying Object. B: It is an Unidentified Flying Object. C: It is an Unknown Flowing Object. D: It is an Unidentified Flowing Object.
- He bowed in homage to the Unknown Soldier.
- In invitation letters, what should we use if the addressee is unknown?
- If the reader's name is unknown, ________________ can be used as the complimentary close.