经过第一个下午的训练之后，运动员们都筋疲力尽了。
After the first afternoon of practice, the players were all in.
“对于第一个实验对象，经过大约20小时的训练，他的数字跨度从7上升到20。”爱立信回忆道。
"With the first subject, after about 20 hours of training, his digit span had risen from 7 to 20," Ericsson recalls.
根据第一个理论，在自然选择的帮助下，每个个体经过进化都适应了这个有规律的环境。
According to the first of these theories, each individual has evolved, aided by natural selection, an adaptation to the rhythmic environment.
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