耳道是连接外耳与中耳的管道。

The ear ___canal is the passage that connects the outer ear to the middle ear.

他游泳的时候耳道进水了。

He got water stuck in his ear ___canal while swimming.

这条运河连接了两个大城市，方便了货物运输。

The ___canal links two major cities, making it easier to transport goods.