广播电视英语短句 第 272 课：罗得西亚热-1

Each year a million cows in Africa die from East Coast fever. 每一年，非洲有一百万头母牛死于罗得西亚热。

The disease is spread by tick bites. 这种疾病是通过俾虫叮咬而传播的。

Young cows are most at risk; they can die within days. 幼年牛最容易被传染。他们几天之内就会死亡。

Farmers and herders can lose up to half or more of their calves to East Coast fever. 农场主和牧民们会因为罗得西亚热损失一半以上的牛犊，

The disease is widespread in eleven countries. 这种疾病已传播了11个国家。