The method isn't much different from a preschool screening, when a group of children are observed on the playground to see who plays nicely.

这种方法与儿童学前甄选没有多大差别。在学前甄选过程中，学校通过观察游戏场上的孩子们来辨别谁表现好。

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When I told a group of school children who displayed helpless behavior that a lack of effort led to their mistakes in math, they learned to keep trying when the problems got tough.

当我告诉一群表现出无助行为的学生说，是缺乏努力导致了他们数学上的错误，他们就学会了在问题变得棘手时继续尝试。

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When we stopped by the side of the road to heat up leftover spaghetti on our way to Phnom Penh, a group of children gathered and stared at us.

在前往金边的路上，我们把车停在路边，准备把吃剩的意大利通心粉热一下吃，有一群孩子围上来看我们。

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The soldier was playing with a group of children outside when the attacker came from behind and stabbed him in the neck with a large knife, Khan said, adding the young man had escaped to nearby Pakistan.

NPR: Afghan Teenager Fatally Stabs US Soldier

Based on their extensive surveillance of the secret agents and their messages to handlers back in Moscow, U.S. counterintelligence officials believe the grooming of Mr. Foley was part of a long-term goal for some of the group's children to become spies when they got older.

WSJ: Russian Spy Ring Aimed to Make Children Agents

Sixteen children were slaughtered and 12 kidnapped when a group of armed men ambushed a bus taking them to school in Bouinane, just south of Algiers.

ECONOMIST: Algeria