Why did you get a swelling one your head?
你头上的包是怎么回事？
I saw a notice on the building gate. Because I am near-sighted, I went close to it to read this notice.
我看大厦门口有个告示，因为我近视，于是就凑近去看。
What did it say?
告示上说什么？
Be careful: the gate is open outwards.
小心：门向外开。