Xiaodong held up his mother's upper body, pinched her mouth open, and then used a coconut ladle to pour water into her mouth. However, his mother did not swallow at all. After the water filled her small mouth, it all overflowed from the corners of her mouth. Her throat did not move at all. After Xiaodong tried twice, he could not pour the water in, because although his mother had a breath, she did not wake up and was still in a coma. If it were in the city, he could use physiological saline to