Lesson15-The Riddle of time I. Wordstudy 5. gear n. a set of equipment or tools齿轮 v. gear up/down促进;增加/降低;减少 gear to使搭配:使配合 Examples: top gear/ bottom gear高速档/低速档 gear up production增加产量 out of gear/ In gear失常/正常 a The countrys economics must be geared to wartime requirements. W BTL E BACLesson15—The Riddle of Time W B T L E I. Word Study 5. gear n. a set of equipment or tools 齿轮 v. gear up/down 促进；增加/降低；减少 gear to 使搭配；使配合 Examples: top gear/bottom gear 高速档/低速档 gear up production 增加产量 out of gear/in gear 失常/正常 The country’s economics must be geared to wartime requirements