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symbiosis

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definition: 
Interaction between two different organisms living in close physical association, typically to the advantage of both
sentence: 
We have a symbiotic relationship, he does all my DIY and drives me to the shops, I deal with his paperwork and make his appointments.
difficulty: 
medium
toefl frequency: 
2
toefl classification: 
adverb: 
adjective: 
adverb sentence: 
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verb: 
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noun: 
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