“With the first subject, after about 20 hours of training, his digit span had risen from 7 to 20, ” Ericsson recalls.

" 在经过大约 20小时的训练之后，第一个试验对象（复述）的数字跨度从 7个上升到 20个，" 埃里克森回忆说。

" With the first subject, after about 20 hours of training, his digit span had risen from 7 to 20, " Ericsson recalls. " He kept improving, and after about 200 hours of training he had risen to over 80 numbers."

“在约 20 个小时训练之后，第一位被试者的数字记忆跨度从 7 个增加至 20 个，” 艾利克森回忆道，“他不断地进步，约 200 个小时训练之后，他能记住 80 多个数宇。”