有些大流行性流感疫苗含有佐剂以便减少病毒抗原的使用量(抗原是能够刺激免疫反应的一种物质)。
Some pandemic vaccines contain an adjuvant to reduce the amount of virus antigen to be used (an antigen is a substance capable of stimulating an immune response).
他说的就是鸡和蛋，他的公司如今仍用它们来制作疫苗，年用量大约为5000万只(个)。数十年来，疫苗产业一直都是这么做的。
He is talking about the things with feathers and the eggs-some 50m of them each year-that his firm still USES to make flu vaccines, just as the industry has done for decades.
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