1. Before silos were invented, cows gave less milk during winter because they had no green grass to eat. 筒仓发明之前，因为没有青草可以吃，奶牛在冬天产奶量减少。
2. If we don't unload it soon, the grain will start rotting in the silos. 如果我们不马上卸货，这些粮食在仓中将开始腐烂。
3. In practice, many of the silos for these grains have not yet been built, and those that have been built are empty or half-full. 实际上，许多用来储存这些谷物的筒仓却还没有建好，而那些已经建好的粮仓却又空着或储存了一半。
