silo

1. N-COUNT A silo is a tall round metal tower on a farm, in which grass, grain, or some other substance is stored. (农场储存草料、谷物等的)筒仓

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。

...a grain silo. ...一个谷物筒仓。

2. N-COUNT A silo is a specially built place underground where a nuclear missile is kept. (核弹的)发射井

...underground nuclear missile silos. ...地下核弹发射井。