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

多发性硬化是IV型超敏应，即细胞介导超敏应。

Combustion is an extremely common reaction type.

燃烧是一应类型。

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

最后应类型是脱氢， 从某程度上来说，它是从烷烃中去除氢原子。

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型超敏应，即由环境过敏原暴露所引起过敏应。