Oral Allergy Syndrome or OAS is an allergic reaction to certain (usually fresh) fruits, nuts, and vegetables that develops in hay fever sufferers.是什么意思_Oral Allergy Syndrome or OAS is an allergic reaction to certain (usually fresh) fruits, nuts, and vegetables that develops in hay fever sufferers.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句