That concern has led some countries, and the European Union collectively, to put programmes for grain fortification on hold.

正是基于这点担心，整个欧盟和一些国家已经暂停了谷物强化的项目。

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There has got growing concern in recent years about the collectively quitting school affairs that take place one after another.

近年来，高校连续发生的集体退学事件引起了社会的广泛关注。

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So that may be one concern that we might collectively have about not allowing segregation to get too entrenched.

BBC: NEWS | Programmes | Panorama | Interview with Professor Webber