Look at the unit, 1+1 =2, 1+1 pair =3, 1 pair =4, 1 refers to+1.

When the units are unified, people agree that: 1+ 1=2.

Possibility = two, = ten, = 1 1, = Wang, = Tian, = Lao, = Feng, = two. ...

In daily life, 1 pile soil+1 pile soil = 1 pile soil+1 bucket water = 1 pile mud. ...

In logical operation, 1+ 1= 1.

In binary, 1+ 1= 10.

Goldbach conjecture: Every even number not less than 6 is the sum of two odd prime numbers, namely "1+ 1".

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