abacus
abacus
ab·a·cus / ˈæbəkəs ; ˈæbəkəs /noun C
1. a frame with small balls that can be slid along on thick wires, used for counting and calculating算盘
abacus
ab·a·cus / ˈæbəkəs ; ˈæbəkəs /noun C
1. a frame with small balls that can be slid along on thick wires, used for counting and calculating算盘
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