由于植物不断生长，西海岸花粉症季节持续存在，导致过敏原引发打喷嚏、眼睛发痒和过多粘液的免疫反应。 West Coast hay fever season persists due to constant plant growth, causing allergens to trigger immunological reactions with sneezing, itchy eyes, and excessive mucus.

在西海岸，花粉症季节是一种持续存在的疾病，因为植物不断生长和开花，导致空气中弥漫着过敏原。 On the West Coast, hay fever season is a persistent condition due to constant plant growth and blooming, leading to airborne allergens. 这些过敏原会引发免疫反应，引起打喷嚏、眼睛发痒和粘液过多等症状。 These allergens trigger immunological reactions that cause symptoms like sneezing, itchy eyes, and excessive mucus. “过敏原”一词是指免疫系统认为是威胁的任何物质，通常会引起无法控制的突然反应。 The term "allergen" refers to any substance that the immune system interprets as a threat, often causing an uncontrollable and sudden response.