정의: 21st is the ordinal form of the number 21. Twenty-first or 21st may also refer to:A fraction, 1⁄21, equal to one of 21 equal parts 21st of the month, a recurring calendar date 21st birthday, the age of majority in a several countries
| 핵심 연구 분야 | Software Development |
|---|---|
| 주요 연도 | 2021년 |
| 주요 연관 키워드 | research |
| 좋아요 수 | 0 |