Now, multiple sclerosis is a type IV hypersensitivity reaction, or cell-mediated hypersensitivity.

多发性硬化IV型超敏反应，介导超敏反应。

Combustion is an extremely common reaction type.

燃烧一种极为见的反应类型。

The final reaction type is dehydrogenation, and it, somewhat obviously, is the removal of hydrogen atoms from alkanes.

最后的反应类型， 从某种程度上来说，它从烷烃中去除原子。

Allergic rhinitis is a type 1 hypersensitivity reaction, which is a type of allergic reaction that starts with exposure to an environmental allergen.

过敏性鼻炎属I型超敏反应，由环境过敏原暴露所引起的过敏反应。