试试 HanyuGuide 的主动间隔重复系统。
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solid as a boulder (idiom); absolutely secure
rock-solid
as solid as rock (idiom); as sure as houses
Panshi, county-level city in Jilin prefecture 吉林, Jilin province
Panshi county in Jilin
dry measure for grain equal to ten dou 斗[dǒu]; one hundred liters
rock
firm