大猩猩摇晃着笼子的栏杆。

The gorilla rattled the ___bars of its cage.

当他们看向湖中时，他们看到了一根长长的金条。

When they looked into the lake, they saw a long ___bar of gold.

他用一根金属棒撬开了门。

He used a metal ___bar to pry open the door.