Every Dragon Boat Festival, people sweep the house clean, sprinkle with realgar water in the kitchen, to kill the vermin or prevent propagation of poisonous insect.
每逢端午节，人们把房子扫干净，在厨房里洒上雄黄水，用来杀死毒虫或防止毒虫孳生。
The practical formula for area of house property precision estimation is developed, from the relations of propagation between the analytical boundary points and the area.
由坐标解析法界址点与面积的误差传播关系、导出了面积精度估算的具体计算公式。
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