natural forage basis

例句：

1. 1.The herdsmen are foraging in the forest for food.
   牧民们在森林里寻找食物。
2. 2.The deer graze on the grasslands during the day.
   鹿在白天在草原上吃草。
3. 3. The farmer has to supplement his forage with purchased feed.
   农民必须用购买的饲料来补充他的饲料。