Traditional: 世紀
世纪 (shì jì) means “century”. It is an HSK 4 Chinese word (traditional 世紀) in the HSK 3.0 vocabulary.
Measure word: 个
21世纪是信息时代。
Èrshí yī shìjì shì xìnxī shídài.
The 21st century is the information age.
Updated: 2026-05-27