雅思阅读里的一句话,十分晕.麻烦各位看看,European countries are being increasingly concerned by major threats to European forests,threats which know no frontiers other than those of geography or climate.前半句能看懂.后半句很晕.而
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欧洲国家正在对欧洲森林的主要威胁变得越来越关注,这些威胁指的是不受任何边界限制的,而不是那些地理和气候的威胁
know no frontiers 不受边界限制