单词学习：reigned 动词（过去式）
reigned
/reɪnd/
统治；支配；盛行
During the period of peace that reigned, Professor Gu was able to focus entirely on his academic research.
在盛行的和平时期，顾老师得以全身心投入他的学术研究。
单词卡片
卡片已就绪
