The research on Mei Lanfang's artistic achievement and the Mei Lanfang school are almost empty, especially the comment in early twentieth century.

对梅兰芳评论研究，尤其是以二十世纪初期的评论为对象，关于梅兰芳戏剧艺术成就以及梅派艺术的研究领域几乎空白。

youdao

Many research achievement have been acquired mainly on the studies of after-hardened volume stability of high-strength concrete and it's early-age cracking.

现有研究主要集中在对高强混凝土硬化后的体积稳定性及其开裂方面，取得了较多的成果。

youdao