Refers to the distinct styles of the four great calligraphers Yu Shinan, Chu Suiliang, Ouyang Xun, and Yan Zhenqing, broadly indicating various schools or traditions of standard script calligraphy.
这位书法家浸淫翰墨数十年，笔法深厚，融合了虞褚欧颜的精髓，形成了自己独特的风格
This calligrapher has immersed himself in ink and brush for decades, possessing profound brushwork that integrates the essence of Yu, Chu, Ouyang, and Yan, forming his own unique style.
Era:
Early Modern
Frequency:
Next Idiom