àbac màgic
魔方陣
生徒たちは、行や列や対角線の和がすべて等しくなる正方形である魔方陣を使って古い伝説を解き明かした。
The students used the magic square to decipher the old legend: it was a square in which the sums of the rows, columns, and diagonals were always the same.
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