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expertise
mastery UK /ˌɛkspɜːˈtiːz/ US /ˌɛkspɚˈtis/nounverb
card 1 of 10 · fill in the blank
The hospital hired a doctor with _____ expertise in treating heart disease.
card 1 of 10 · fill in the blank
The hospital hired a doctor with _____ expertise in treating heart disease.