abacus mental arithmetic education 珠心算教育
Abacus & Mental Arithmetic 珠心算班
abacus arithmetic
abacus算术
以上为机器翻译结果，长、整句建议使用 人工翻译 。
At some stage documents with numbers, and even long-term aspirations, will become necessary again, and the nation that invented the abacus will have to overcome its aversion to arithmetic.
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