In sensitive people, anaphylaxis can occur within minutes or up to several hours after exposure to a specific allergy-causing substance.

一些敏感性体质的人群，在暴露于特定的引起过敏的物质时，会在几分钟至几小时之内发生过敏反应。

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Sometimes it overreacts to what should be a perfectly innocuous food or other substance, causing an allergic reaction.

有时，它会对某种完全无害的食物或其它物质产生过度反应，导致过敏反应。

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The substance that's causing the problem comes from the barley.

引起该问题的物质来自大麦。

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This was despite repeated clinical trials which have found that homeopathic medicines - which contain heavily diluted traces of the substance causing the illness - are ineffective.

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Energy is delivered from the laser to the target, causing its outer layer to explode, which drives the inner substance of the target inwards, compressing it massively.

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"Diagnoses made casually and based on insufficient evidence can stick with someone for life, causing needless stigma and affecting job and insurance opportunities long after the substance problem has resolved, " he says.

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