abacus
Definition
A device consisting of beads or counters on wires used for performing arithmetic calculations
日本語 算術計算に使用するそろばん装置
Example
"The ancient Egyptians used an abacus to calculate trade balances and taxes."
A device consisting of beads or counters on wires used for performing arithmetic calculations
日本語 算術計算に使用するそろばん装置
"The ancient Egyptians used an abacus to calculate trade balances and taxes."