Englishfor English speakers
nucleus
Noun
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A nucleus is the center of a cell or atom.
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The center of anything.
destruction
Noun
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The destruction of a thing is the act of breaking the thing; the end of existence of the thing. Before the destruction, the thing is there. After the destruction, there is no thing any more.
The destruction of the house was necessary because the walls were not strong and people were not safe from falling bricks.
The earthquake caused a lot of destruction.