YOU SAID:

Oh no that girl has a normal sized forehead

INTO JAPANESE

ああ、その女の子は普通の大きさの額を持っています

BACK INTO ENGLISH

Oh, that girl has an ordinary size forehead

INTO JAPANESE

ああ、その女の子は普通のサイズの額を持っています

BACK INTO ENGLISH

Oh, that girl has an ordinary size forehead