Poring over their fine-quality crochet, the prisoners of Brazil's Arisvaldo de Campos Pires maximum security penitentiary are a model of concentration.

盯着手中这些制作精良的钩编织物，巴西坎波斯皮雷最高安全戒备监狱里的囚犯们，无疑成了集中注意力的典型代表。