| 单词 | change up | 
| 释义 | Word Frequency change upverb 1. (intr, adverb) to select a higher gear when driving  noun change-up 2.  baseball an unexpectedly slow ball thrown in order to surprise the batter  Word Frequency change-up(ˈtʃeɪndʒˌʌp) noun  baseball an unexpectedly slow ball thrown in order to surprise the batter  | 
	
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