A student who learns to handle Numbers mentally can focus on how to attack a problem and then complete the actual calculations easily.
学会心算的学生能把注意力集中到如何解题上，然后轻而易举地完成实际运算。
A student who learns to handle Numbers mentally can focus on how to attack a problem and then complete the actual calculations easily.
学会心算的学生能把注意力集中到如何解题上，然后轻而易举地完成实际运算。
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