Excuse me, do you know where the library is?

The answers given to you by others may include the following phrases.

Turn left (turn left)

Turn right (turn right)

Go straight (straight)

Go along ... (Go ahead ...)

If you are in a foreign university campus, you can ask someone for a map (like bookstores and pharmacies on campus, you should have them all, just ask the clerk for it ~ you can ask the clerk who can speak Chinese ~)