Predicting exactly who will succumb to PTSD after a trauma is hard to do. Having a history of anxiety or depression seems to up a person's risk.

准确预测谁会患上创伤后应激障碍并不容易，有焦虑史或抑郁史的人患病风险较高。

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"They are trying to impose their will on Syrian decision-making, but history has proven that Syria does not succumb to pressure, " he said.

BBC: Syria condemns EU sanctions on Bashar al-Assad

So should we succumb to a race to the bottom and a protectionism that history tells us that, in the end, protects no-one?

BBC: In full: Brown's speech to Congress