You can ride your bike to school, but remember to be careful ____ .　　

This magazine isn't popular with the students though it____  every week.

It's difficult____  both the old and the young about the program at the same time.

The kids clapped and shouted ____ when the actor appeared.

Though he is very busy, he goes to the movies to relax____ 

The children are interested in playing the piano, so they need more____ 

The visitors ____  not to swim in this river for several times.

There are no students in the classroom. They ____  on the playground.

Thank you for____  the museum. We've learned a lot.

You must do more exercise, ____  twice a week.

什么是好电影，不同的人有不同的看法，电影经常出现“叫好”和“叫座”的矛盾，有些电影的艺术价值很高，但是票房却遭到冷遇；有些电影过度关注“眼球效应”，缺乏社会主义核心价值观这样立得住的文化内核，虽获得高票房，却是“低口碑”。

结合材料，回答下列问题：

运用《文化生活》知识，简析我国电影需要“立得住的文化内核”的原因。