求翻译：近年来，面对全球气候转暖，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 on the disturbing effect of the permafrost region, the Qinghai-Tibet Railway to change the past has been in use passive permafrost protection measures, and change the "passive insulation" "active cool ", a pro-a

In recent years, with global warming, and the various works in Tibet for many years permafrost areas of turbulence effects, changes to the current construction of the Qinghai-Tibet Railway has been a passive protection measures, and the permafrost soil is "passive" to "keep cool" initiative, a posit

In recent years, transferred facing the global climate warmly, 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 continue

In recent years, face global climate go 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"

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