同时它利用周期性负压和少量多次注酸，限制水井酸处理的污染范围，降低对地下水的污染程度。
Using periodic negative pressure and less amount of acid with multiple injection effectively reduces groundwater pollution.
同时，瓦克斯将在秋天利用类似的病毒颗粒来进行周期性的流感疫苗的人体测验。目前，所有的疫苗都是基于鸡胚培养系统。
Meanwhile, Novavax will be begin human tests of its seasonal influenza vaccine, using virus-like particles, in the fall. Currently all U. S. flu vaccines are egg-based.
利用光学周期平均法能够清晰地描绘带有噪声的周期性图象。
Noisy images with a periodic structure can be cleared by utilizing optical periodic average method.
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