advent
noun [ S ] uk/ˈæd.vent/ /ˈæd.vənt/ us/ˈæd.vent/ /ˈæd.vənt/
（事件、发明或人物的）出现，来临，到来
the fact of an event happening, an invention being made, or a person arriving
Life was transformed by the advent of the steam engine. 蒸汽机的出现使人类生活发生了翻天覆地的变化。