Can someone please translate this for me?

This may be chinese or japanese, i don’t know as they both use same letters
i know japanese so i’ll tell you what each letter means in japanese, if chinese they still will mean something similar although not directly the same

the first letter means out, or go out
the second means in, or go in
the third means flat or parallel
the fourth means steady or safe, something along those lines and also cheap

the second and first letters together means to go in and out, in japan they write those letters and also the letter “mouth” or inside and it means the entrance and exist, just like how the letters mean

i’m sorry but i don’t know what the third and fourth letters together mean.

There is a computer in my classroom and how is that a question?