source of feed

例句：

1. 1.The farm relies on the source of feed to sustain its livestock.
   农场依靠饲料来源来维持其牲畜。
2. 2. The research team is investigating the source of feed for the disease.
   研究小组正在调查这种疾病的饲料来源。
3. 3.The farmer carefully selects the best sources of feed for his livestock.
   这位农民仔细挑选了最适合他牲畜的饲料来源。