New Words：

cannon ['kænən]
n.大炮
v.开炮,相撞

Sample Sentences：

The cannon shot the town to pieces.
They shot the cannon balls at the other ship.
The cannon fired from the tank destroyed the building.
A big dog came running round the corner, cannoned into him, and knocked him over.

knock [nɔk] v. 敲；撞；击；打

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