prepose; preposition; pre-前: front置: place; put; lay前置泵: booster pump; fore pump; front-mounted pump; prepump; roughing pump前置波: vorwellen pre-wave前置词: [语言学] preposition◇前置词宾语 prepositional object; 前置词短语 prepositional phrase下载手机词典可随时随地查词查翻译