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摘要

This year marks the centenary of the lethal chlorine gas attacks at Ypres in Belgium, a spectre whose long shadow refuses to abate. Witness a barrage of stories that exploded across the UK daily newspapers recently, warning that the country faced chemical attack by home-grown jihadists. These terrorists, we are told, have worked out how to fashion crude chemical weapons by lacing conventional bombs with chlorine gas. "The chlorine that is often used in bombs," rumbled the front page of The Times, "comes from the cylinder on the back of household fridges."