+- 讨论区 (https://www.lightknotes.com/MyBB)
+-- Forum: My Category (https://www.lightknotes.com/MyBB/forumdisplay.php?fid=1)
+--- Forum: My Forum (https://www.lightknotes.com/MyBB/forumdisplay.php?fid=2)
+--- Thread: his explanation (/showthread.php?tid=142805)
his explanation - RonaldWoria - 10-21-2024
read this https://library.irisgroup.gr/uncategorized/abacus-definition-how-it-s-used-and-modern-9/