YOU SAID:
You have altitude sickness!
INTO JAPANESE
高山病になっています!
BACK INTO ENGLISH
I have altitude sickness!
INTO JAPANESE
高山病になってしまった!
BACK INTO ENGLISH
I got altitude sickness!
INTO JAPANESE
高山病になってしまった!
BACK INTO ENGLISH
I got altitude sickness!
That didn't even make that much sense in English.