milking cow

例句：

1. 1. The farmer milks his cows every morning.
   这位农民每天早上挤他的奶牛。
2. 2. The cows are milked at the farm every day.
   这些奶牛每天在农场被挤奶。
3. 3. She has to milk her cows before leaving for work.
   她必须在离开前挤她的奶牛。