black belt

black-belt的词性：
n.（名词）

1. The rank of expert in a martial art such as judo or karate.
黑腰带级：在武术，如柔道或空手道中的最高等级

2. The black sash that symbolizes this rank of proficiency.
黑色腰带：象征这种级别的黑腰带

3. A person who has attained this rank.
黑腰带级武师：获得这种级别的人

4. A region of rich, black soil.
黑带：有肥沃黑土的地区

5. Often Black Belt An area having a predominantly Black population.
常作 Black Belt 占主导地位的黑人区