permafrost
🇬🇧/ˈpɜːməfrɒst/ 🇺🇸/ˈpɜːrməfrɔːst/ 18雅思Permafrost is land that is permanently frozen to a great depth. 永冻土层
noun [专属名词]多年冻土；永久冻结带；永久冰冻
Their roots don't grow very deep, so the permafrost doesn't interfere with their growth.
它们的根长得不深，所以永久冻土不会影响它们的生长。
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