名词
1. 宇宙
The universe is the whole of space and all the stars, planets, and other forms of matter and energy in it.
2. 经验领域
If you talk about someone's universe, you are referring to the whole of their experience or an important part of it.
3. 全天下，宇宙万物中（最）
If you say that something is, for example, the best or biggest thing of its kind in the universe, you are emphasizing that you think it is bigger or better than anything else of its kind.
1. everything stated or assumed in a given discussion
Synonym: universe of discourse
2. (statistics) the entire aggregation of items from which samples can be drawn
e.g. it is an estimate of the mean of the population
Synonym: population
3. everything that exists anywhere
e.g. they study the evolution of the universe
the biggest tree in existence