There are several events, but the key element is the control of three to six sheep by one or two highly trained dogs under the control of a single handler.
牧羊犬比赛的形势有好几种，一种比较受欢迎的比赛要求一只或两只训练有素的犬只能在一名指导手的引导下控制三至六只羊。
This paper presents and analyzes computer network security and the element, and also introduces three key points to implement the integrated network security.
介绍并分析了计算机网络安全及其元素，并介绍了实现整体网络安全的三个要素。
The three-dimensional finite element method was used to solve some key problems in the design of the box floor in Suzhou River Estuarine Lock project.
针对苏州河河口水闸工程中的大跨度箱形底板设计中遇到的困难，利用三维有限元对底板结构进行计算分析。
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