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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Even if you think you know what is causing the allergic reaction, you may need to be tested to find out the exact allergen.

即使你认为你知道什么是造成过敏反应，您可能需要进行测试，以找出确切的过敏原。

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What do you be allergic to ?

你对什么东西过敏吗？

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"The thing about allergic reactions that is interesting, or scary, is that we never know what the next allergic reaction is going to be, " he said.

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What if innovation is just too hard, and one happens to be allergic to death?

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