Young people's disenchantment with the ballot box matters because voting is a habit : those who do not take to it young may never start.
Young people's disenchantment with the ballot box主语 matters不及物动词作谓语 because voting is a habit原因状语从句 : those who do not take to it young may never start冒号后部分为对voting is a habit的解释、说明,为补充语。
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