英文翻译：淡季 和 旺季

淡季
a dull or slack (business) season;
a low season;
an off-season;
slack time

旺季
the peak period;
the busy season;
the rush season;
the boom season

淡季 [简明汉英词典]
a dead season
low season
off-season
slack
旺季 [简明汉英词典]
midseason

淡季a dead season,low season
旺季busy season

Off season and busy season