The Zhusuan, or China's abacus, was doing the math long before the electronic calculator was invented.
珠算，即“中国的算盘”，在计算器被发明之前一直是主要的计算工具。
The main building of Nantong Zhusuan Museum is made of concrete structure, the roof and curtain wall made of steel structures.
南通珠算博物馆主体结构采用混凝土结构，屋盖及玻璃幕墙支承体系采用钢结构。
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