Festivals are meant to celebrate important times of year.为什么

在(一年的)这个时节里 每年的这个时候
at this time of ……的这个时候...e.g.at this time of year 每年的这个时候..强调每年,动作重复,不需要冠词 ..
例句
At this time of year,oysters.
虫豪是这时节的特产.
Fruit is dear at this time of year.
一年中这个时候水果是很贵的.
Water is short at this time of year.
每年这个时候缺水.
It often rain at this time of the year.
这个时候上海经常下雨.
There's not much fear of frost at this time of year.
每年这个时候,就不用担心会下霜冻了.