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。
Propagation characteristics of longitudinal modes in pipes filled with and without water were investigated theoretically.
对未充水和充水管道中纵向模态的传播特性进行了研究。
Based on the mechanics of wave, the expression of water wave propagation velocity under the action of gravity is deduced and the effect of surface tension on small wave is analyzed.
本文根据波动理论推导出在重力作用下波的传播速度表达式，分析了微小波动中表面张力的作用。
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