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TOEFL® Vocabulary Practice

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definition: 
simple in structure, easy to do
sentence: 
No one wants to send elementary school children on public transportation by themselves through crime-ridden neighborhoods.
Particle decay occurs when elementary particles spontaneously transform into other elementary particles.
difficulty: 
easy
toefl frequency: 
3
toefl classification: 
adverb: 
adjective: 
adverb sentence: 
adjective sentence: 
verb: 
verb sentence: 
noun: 
noun sentence: