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How to understand the left and right in the first grade math textbook
It depends. Generally speaking, the left side of your body is the left side and the right side is the right side. In some specific cases, such as several characters in the picture face to face with us at the same time, when explaining who is left and right in the picture, the body of the characters in the picture shall prevail.

The purpose of teaching is to distinguish between right and left, just master the concept, otherwise it will cause trouble.