YOU SAID:

if it quacks like a duck, then it is a duck

INTO JAPANESE

それがアヒルのように鳴くなら、それはアヒルです

BACK INTO ENGLISH

If it sounds like a duck, it's a duck

INTO JAPANESE

アヒルのように聞こえるなら、それはアヒルです

BACK INTO ENGLISH

If it sounds like a duck, it's a duck