资料来源 : pyDict

季节的,依照季节的,周期性的

资料来源 : Webster's Revised Unabridged Dictionary (1913)

Seasonal \Sea"son*al\, a.
   Of or pertaining to the seasons.

资料来源 : WordNet®

seasonal
     adj : occurring at or dependent on a particular season; "seasonal
           labor"; "a seasonal rise in unemployment" [ant: {year-round}]