Write the word chicken () sheep () duckling () calf () crow () frog () in brackets.

Brother Ji (giggle)

Lamb (baa baa) baa

Little duck (quack quack)

Xiaoniu (Cleisthenes moo) Mou

It is said that crows are unlucky. I have never heard of them.

Frog (quack quack) quack.

In fact, many voices are not true when expressed in words, and they are not as natural as they are invisible.