孩子在家里做作业,桌椅需要一个合适的高度。椅子过高,两足悬空,无支撑作用,会造成大腿着力一侧的血管、神经处于被压状态,从而影响血液循环,引起下肢疲劳或麻木。如冬天受寒,足部血流不畅,易患冻疮,进而反射性地引起鼻黏膜收缩以致伤风感冒; Children at home doing homework, tables and chairs need a suitable height. The chair is too high, two feet vacant, unsupportive role, will cause the thigh to exert one side of the blood vessels, nerves in a state of being pressed, thus affecting the blood circulation, causing lower extremity fatigue or numbness. Such as the winter cold, poor blood flow in the foot, susceptible to frostbite, which in turn cause nasal mucosal contraction caused by colds and flu;