e.g. The tree's trunk was hollow, since it had died many years ago.
e.g. His face looked thin and hollow from the lack of food.
e.g. We heard a hollow knocking from the other side of the door.
e.g. They asked a series of hollow questions that didn't tell them anything useful. She had a hollow smile on her face as she delivered the news.
e.g. The squirrel lived in a hollow in the tree.
e.g. I learned how to hollow out the trunk of a tree to make a boat.
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