for all seasons

suitable in or appropriate for every kind of weather

四季皆宜的

a coat for all seasons.

四季皆宜的外套。

season's greetings

used as an expression of goodwill at Christmas or the New Year

致以节日的问候（圣诞或新年时的问候语）

in season

Available or ready for eating or other use.

当令的：现成的或准备食用或其它用途的

Legally permitted to be caught or hunted during a specified period.

猎捕期的：法律上允许在某一持定时期内可进行猎捕的

At the right moment; opportunely.

及时的：在合适时间的；碰巧的

In heat. Used of animals.

发情中。用于动物

out of season

Not available, permitted, or ready to be eaten, caught, or hunted.

不当令的：不现成的、不被允许的或尚不能吃、抓或猎捕的

Not at the right or proper moment; inopportunely.

不合时宜的：不在合适的或正确的时间的；不凑巧的