livestock是不可数名词；livestock n.牲畜;家畜；
例句：
And the ground floor is for keeping things and livestock.
下面一层是用来堆放杂物和养牲畜的。
Cloning may also bring about new strains of livestock.
无性生殖还能培育牲畜的新品种。
The heavy rains and flooding killed scores of livestock.
暴雨和大水淹死了许多牲口。
Farmers were encouraged to keep their livestock in pens rather than letting them roam freely.
鼓励农民们把家畜关进栏圈，而不是让它们到处乱跑。
温馨提示：
