3. A new day is unknown, you ready to discover it? 新的一天是未知的，准备好去发现它了么?
1. an unknown and unexplored region
2. anyone who does not belong in the environment in which they are found
3. a variable whose values are solutions of an equation adj.
1. not known
2. being or having an unknown or unnamed source
3. not known to exist
4. not famous or acclaimed
5. not known before