a mystery, wonder / a miracle / an extravagance / curiosity / strangeness / a suspicion

work, task, business: the job at hand / profession, business, trade: what one does to earn a living / studies, scholarship (the act of being a scholar), the arts

七不思議: the Seven Wonders of the World

a year

滔滔, 滔々: torrential (of flowing water); voluble (of speech); flowing strongly in one direction (of a matter of the times)

finally; at last

to graduate / to outgrow / (Japanese entertainment) to graduate (leave a group)

産業化: industrialization

three, 3 / third

three years; the third year / (education) the third school year / (figuratively) a long period of time, several years