Double Distillation（二次蒸馏）：由于汽化酒精中常含有一定量的杂物，因此威士忌酒厂常采用二次甚至三次蒸馏等工艺来获取纯度高、杂质少的酒液。
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double-tower distillation 双塔蒸馏
double effect distillation 双效蒸馏
double-effect distillation 双效精馏
backward-feed double-effect distillation 逆流双效精馏
double effect pressure swing distillation 双效变压精馏
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The macerated bitter orange peel is the same fruit used in the other variants of Grand Marnier, but this time they employ a unique double distillation, whereas it is usually distilled just once.
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