kàn wán tōng zhī yǐ hòu tā cái zhī dào lóu dào bù zhǐ shì mén wài de kòng dì yě shì bié rén yào jīng guò de lù

看完通知以后，她才知道楼道不只是门外的空地，也是别人要经过的路。

After reading the notice, she realized that the hallway is not just an open space outside the door, but also a path that others need to pass through.