time for doing something / period of time / season

important, significant

importance, consequence, significance

history / the study of history

age, era, period (of time) / the times, spirit of the age / antiquity / a time in one's life, one's days (in college etc.)

the Mesolithic

inside

中々: very, quite, considerably, rather, by no means (with negative verb)

very, quite, considerably, rather / by no means (with negative verb)

the daytime, during the day / a half day, half of a day