穿越法

这种状况使得路由器的测试变得更加复杂，而且现有的测试方法回绕测试法（LTM，Loop-backTestMethod）和穿越测试法（TTM，TransverseTestMethod）无法适应现代多端口路由器的测试。

Moreover , existing testing methods such as Loop-back Test Method ( LTM ) and Transverse Test Method ( TTM ) are not catered for testing modern routers with multi-ports .

失误分析显示，穿越隧道没法提供规定精准的控制点。

An error analysis has shown that a tunnel traverse cannot supply reference points with the required accuracy .

针对长江流域水文地质条件变化大的特点，对油气管道穿越长江的方法进行了介绍，重点分析了水平定向穿越法、矿山隧道法、盾构法的施工原理和特点。

As to the diversification of the hydrological and geological conditions along the Yangtze River , the possible measures for oil-gas pipeline crossing through the Yangtze River were introduced , including the horizontal-directional drilling method , mining tunnel method and shield construction method .