Sure, here's the translation:
```html
Li Yan shone his flashlight upwards, illuminating the unlit houses on the surrounding floors. After a while, likely making the security outside suspicious, he finally heard a response from Yu Xiaodi.
"I see it... You're on my left, I'm higher up..."
Li Yan quickly asked, "Which direction do you see my car lights coming from?" The left side of different buildings could be exact opposites.
"Left, more to the left..."
Li Yan immediately understood; it should be the building on the edge. He quickly directed his flashlight towards the unilluminated rooms over there, room by room, at a fast pace.
"I'm shining the flashlight over now. If it hits your window, make a sound!"
"Okay."
Just as Li Yan was using this method of elimination by shining on each room, the security guard from the post finally approached. Seeing him busy, and looking over that way, he politely asked, "Sir, what are you doing here?"
