- 穴(row; gap)
- 工(craftsman; work)
An empty cave with nothing inside is just hollow space.
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air warfare
Air warfare is a part of modern war.
air war
Air combat is a part of modern warfare.
air warfare
Air warfare is a part of modern war.
air war
Air combat is a part of modern warfare.
An empty cave with nothing inside is just hollow space.
An empty cave with nothing inside is just hollow space.
air warfare
air warfare
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