How do you say

Children participated in a lot of educational activities during the summer vacation. Chinese?


hái zi men zài shǔ jià qī jiān cān jiā le hěn duō yǒu yì de jiào yù huó dòng 。

How do you say "There has been great variation in the weather in Beijing recently, with a large temperature difference between day and night; one must take care to wear adequate clothing to keep warm." in Chinese?