Sometimes cows are given chemicals and artificial foods to make them grow more quickly.

有时会给奶牛喂化学药品和人工食品，以使其生长更快。

While food has substitutes in the form of natural medicines or artificial foods, there are no substitutes for sleep and rest.

虽然食物可以用天然药物和人工食物取代，但睡眠和休息却没有任何替代品。