Students had to complete a difficult mental math task in front of the same upper-year students.
学生们必须在同一批高年级学生面前完成一项艰巨的心算任务。
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The heart-stopping moment was quickly followed by mental math.
在这个惊心动魄的时刻之后，我很快就开始在内心计算。
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模块上移
模块下移
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