The school teachers strength is abundant, has one both to understand the theory and to have the very strong experience "the double teacher" the teacher troop;

学校师资力量雄厚，拥有一支既懂理论又有很强实践经验的“双师型”教师队伍；

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"If you work hard, your exam score will double," the teacher said to Jim.

“如果你努力学习，你的考试分数会翻倍。”老师对吉姆说。

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When the teacher randomly checks the attendance, the double is there to say "present!" when Cheng's name is called.

老师随机检查出席率时，每当点到程明的名字，替身就会提他喊到。

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Schools in London already face a staff crisis as the city has double the teacher vacancies compared with the national average and could find it hard to recruit qualified staff in the autumn.

BBC: Change may prompt teacher crisis