highest efficiencynoun USA: haɪ'ʌ·st ʌ·fɪ'ʃʌ·nsiː· UK: haɪɪst ɪfɪʃnsiː
highest efficiencyexp USA: haɪ'ʌ·st ʌ·fɪ'ʃʌ·nsiː· UK: haɪɪst ɪfɪʃnsiː
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