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High-voltage direct current power line

electric power transmission system

Pronunciation
/haɪ - ˈvoʊltɪʤ dəˈrɛkt ˈkərənt ˈpaʊər laɪn/
/hʌɪ - ˈvəʊltɪʤ dʌɪˈrɛkt ˈkʌrənt ˈpaʊə lʌɪn/