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vibrate

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definition: 
Move continuously and rapidly to and from
sentence: 
Neils Bohr's model of the atom, set forth in a series of papers in 1913, described atoms as constantly in motion, continuously vibrating, and moving. In conventional superconductors, vibrations of atoms induce electrons, which normally repel each other, to form pairs
difficulty: 
very easy
toefl frequency: 
2