七十岁的德里克·牛顿说，“鱼也需要帮助。”牛顿已经为奈尔消防队当了十年义工。
"The fish need help too," said Derek Newton, 70, who has volunteered for the Nile Fire Department for 10 years.
3个世纪前，艾萨克·牛顿出版了《光学》；今天，这门古老的科学变得十分离奇。
Three centuries after Isaac Newton published his Opticks, that ages-old science got really weird.
经过电力科技工作者们几十年的研究，纯交流系统的潮流算法现在已经相当成熟，其中最常用的是牛顿法和PQ分解法。
Through decades of the hard work, the flow calculation for AC system has been quiet mature, among which the most commonly used are the Newton method and PQ Decomposition.
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