这些是季节性蔬菜，所以只在一年中的特定时间才有。

These are ___seasonal vegetables, so they're only available at certain times of the year.

这家农场在夏季提供很多季节性工作。

The farm offers a lot of ___seasonal work during the summer months.

很多学生在假期寻找季节性工作。

Many students look for ___seasonal jobs during their holidays.