求翻译：近年来，面对全球变暖，加之进藏的各项工程对多年冻土地区的扰动影响，青藏铁路建设改变以往一直沿用的消极被动保护冻土的措施，变“被动保温”为“主动降温”，采用积极主动的保护冻土措施，研究开发新的地温调控原理和技术，提出能冷却地基的新的路基结构形式和设计参数，以确保工程稳定是什么意思？

In recent years, in the face of global warming, coupled into the possession of the works disturbing effect on the permafrost regions of Qinghai-Tibet Railway to change the past has been in use passive permafrost protection measures, and change the "passive holding" active cooling , the use of proact

In recent years, with global warming, and the Tibet of the works of many of the disturbances in permafrost areas, construction of the Qinghai-Tibet Railway has been changed from the previous practice of passive protection measures, and the permafrost soil is "passive" to "keep cool" initiative, a po

In recent years, changed facing the whole world warm, adds each project which it came into Tibet to many year frozen earth area disturbing influence, the negative passive protection frozen earth measure which the Qinghai and Xizang railroad construction change formerly continuously continued to use,

In recent years, face global variable warm, coupled with into reservoir of the engineering on years frozen area of disturbance effect, Qinghai-Tibet railway construction change past has been followed of negative passive protection frozen of measures, variable "passive insulation" for "active cool",

正在翻译，请等待...