gear downgearing-downspeed reduction gearing减速: moderate; reduce the speed; ...传动装置: transmission; gearbox; geari ...减速传动减速传动装置: gearing-down; gearingdownn二级减速传动装置: double reduction gear变速传动装置: speed gear; speed transformation transmission; speed transforming transmission; variable speed drive device; variable speed drives; variable-speed drive下载手机词典可随时随地查词查翻译