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In order to reduce children's drowning, children must first learn to swim. Taking into account the economic poverty and backwardness of underdeveloped countries, this program is made of cheap wood.
Just dig a puddle first, make a shelf with a wooden stick, put the shelf into the water, and practice swimming.
There are openings in the four pillars of the shelf, and the height and elevation can be adjusted by adjusting the position of the wooden wedge.
Nanjing University of Science and T
Nanjing University of Science and Technology