Butterworth is from University College London and an expert on dyscalculia, a psychological disorder that makes it nearly impossible to deal with numbers, not to mention complicated math.

• 是来自伦敦大学研究计算困难的专家,计算困难是一种心理疾病,如果患上这种病,就会使人不能应对数字,更别提复杂的计算了。