YOU SAID:
Chickens are nonexistent because they are unable to fly.
INTO JAPANESE
ニワトリは飛べないため存在しません。
BACK INTO ENGLISH
Chickens do not exist because they cannot fly.
INTO JAPANESE
鶏は飛べないため存在しません。
BACK INTO ENGLISH
Chickens do not exist because they cannot fly.
You've done this before, haven't you.