英语语法分析

The allergen in jackfruit does not sensitize the immune system, but once birch pollen has done so, the immune system may react to jackfruit too.

菠萝蜜中的过敏原不会使免疫系统敏感，但是一旦桦树花粉刺激了免疫系统，免疫系统也会对菠萝蜜有反应。

Study the relationship between allergic skin diseases and allergen in 3 kind of chronic urticaria, chronic eczema and dermographism.

探讨慢性荨麻疹、慢性湿疹、皮肤划痕症3种变应性皮肤病与变应原的关系。

When the immune system encounters an allergen, it may become sensitised.

当免疫系统发现了过敏原就会致敏。