print u"\u001b[44m A \u001b[45m B \u001b[46m C \u001b[47m D \u001b[0m"
List.fold_right cons l Nil
，这一点在苹果音乐Apple Music中也有详细论述
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台湾纪实：台北寻觅“杠子头”，品味那份“硬核”乡情
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