step-up /ˈstɛpˌʌp/
(a.)把電壓升高的,遞升的
Step-up, a. Elec. Transforming or converting a low-voltage current into one of high voltage; as, a step-up transformer.
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step-up
n : the act of increasing something; "he gave me an increase in
salary" [syn: increase] [ant: decrease]