repetitionn.重复；反复repetition interval脉冲周期,重复间隔repetition character重复字符repetition retrieval[计] 重复检索repetitions patterns重复图样repetition statement重复叙述Repetition Questions跟读题型repetition of symbol符号重复repetition frequency重复率,换帧频率,重复频率repetition structure重复结构repetition operation重复操作