现在最大的困难就是：全球需要大量生产疫苗抵抗大范围流感疫情，而当前的生产能力仅能生产很少量用以对付季节性流感。

The snag is that the world's capacity to create a vaccine against pandemic influenza is based on the smaller amounts needed to fight seasonal flu.

youdao

现在最大的困难就是：全球需要大量生产疫苗抵抗大范围流感疫情，而当前的生产能力仅能生产很少量用以对付季节性流感。

The snag is that the world's capacity to create a vaccine against pandemic influenza is based on the smaller amounts needed to fight seasonal flu.

youdao