What does culture mean in a broad sense?

Discuss the features of styles of language by analyzing the following sentences.

(1)Visitors should go up the stairs at once.

(2)Would you mind going upstairs right away, please?

(3)Time you all went upstairs, now.

red handed

a nine days wonder

What are allusions? How do they reflect culture?

没什么，这是我应该做的。

知识就是力量。

久仰大名

Why was“Poison”that seemed a shock to people used as a perfume brand name?

What is psychological time orientation?

今天的人民日报在哪儿?