广播电视英语短句 第 272 课：罗得西亚热-4

Farmers have been using supplies produced in the nineteen nineties. Recently there was a shortage. 农场主们使用的还是90年代生产的疫苗。最近还开始短缺。

The International Livestock Research Institute made one million doses at the request of African officials. 国际牲畜研究会应非洲官员请求制作了一百万份的剂量。

But that supply is only temporary. 但这只是临时的。

Another problem is that the vaccine must be kept extremely cold. 另一个问题就是疫苗必须冷冻保存。

Now, the nonprofit Global Alliance for Livestock Veterinary Medicines is trying to expand production and lower the cost. 现在，非营利全球牲畜兽医联盟会正在尝试扩大生产，降低成本。