求翻译：多年冻土天然上限在工程中应用最多，是冻土的重要标志，直接影响到多年冻土抵抗外界干扰能力，因而，对块碎石路基基底土体的稳定影响是不容忽视的。是什么意思？

Natural upper limit of permafrost in the project the most important symbol of the permafrost, directly affecting the permafrost to resist outside interference, and thus can not be ignored, the steadying influence of block gravel subsoil of the subgrade.

Multi-year frozen natural limit in construction applications, it is up to the frozen ground, and this has a direct impact important signs that the multi-year frozen ground outside interference resistance, and thus, the block Base subsoil gravel roadbed stabilization of the body affected is not to be

The many year frozen earth natural upper limit applies most much in the project, is the frozen earth important symbol, affects directly many year frozen earth resistance external interference ability, thus, to the block broken stone ballast basis soil body stable influence is not allow to neglect.

Permafrost engineering applications and up to the maximum of natural, is an important symbol of frozen soil, directly affecting permafrost resistance to external interference and, consequently, to blocks of crushed stone basement soil stability effects should not be ignored.

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