试一试以3为间隔从100倒数数，或者，倒背字母表。
Try counting backwards from 100 by 3's, or saying the alphabet backwards, etc.
他们要求病人完成一项中度压力任务：每间隔7个数字来倒数数字。
The patients performed the mildly stressful task of counting backwards in sevens.
看完照片之后，他们被要求从8211开始倒数，每隔7个数数一次，数完后再看另一个人的照片，他们与此人相识但不相爱，然后再倒数。
After looking at the photos, they were asked to count backward from 8, 211 by 7s, then look at another picture of a person they knew but were not in love with, then count backward again.
看完照片之后，他们被要求从8211开始倒数，每隔7个数数一次，数完后再看另一个人的照片，他们与此人相识但不相爱，然后再倒数。
After looking at the photos, they were asked to count backward from 8, 211 by 7s, then look at another picture of a person they knew but were not in love with, then count backward again.
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