The next sentence of 12345 is to go up the mountain and shoot tigers. This is a nursery rhyme in the first grade Chinese textbook. The full text is as follows:

12345, Jin Mu, fire, water, soil,

Heaven and earth are divided up and down, and the sun and moon shine today.

In this nursery rhyme, "12345" describes numbers, while "Jin Mu, fire, water and earth" describes matter. Together, the two can express a simple world view. And "heaven and earth are divided up and down, and the sun and the moon shine today" is a simple description of the laws of time, space and nature, which has strong educational significance.