自20世纪40年代以来，疫苗制造商已经在鸡蛋中培养了大量的病毒。
Ever since the 1940s, vaccine makers have grown large batches of virus inside chicken eggs.
自20世纪40年代以来，疫苗制造商已经在鸡蛋中培养了大量的病毒。
Ever since the 1940s, vaccine makers have grown large batches of virus inside chicken eggs.
在十九世纪五十年代，萨缪尔m科尔，宾西法尼亚西部的一位制造商，开始从当地的溢出物中收集石油并将它炼成煤油。
In the 1850's Samuel M. Kier, a manufacturer in western Pennsylvania, began collecting the oil from local seepages and refining it into kerosene.
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