C1048 Let the World Listen to the Voices of the People of Shanghai

What kind of man has calluses on his thumb and forefinger?

As soon as these words were spoken, the crowd instantly fell silent.

The calluses on the thumb and forefinger could be explained. Many jobs could do this, for example: screw, screw valve.

But the index finger had calluses, which reduced the range by a circle.

If the index finger and thumb had calluses