step-down /ˈstɛpˌdaʊn/
(a.)降低電壓的,遞降的下車,下臺,減少
Step-down, a. Elec. Transforming or converting a current of high potential or voltage into one of low voltage; as, a step-down transformer.
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step-down
n : the act of decreasing or reducing something [syn: decrease,
diminution, reduction] [ant: increase]