The IUCN red list identifies polar bears as a vulnerable species, citing global climate change as a "substantial threat" to their habitat.
世界自然保护联盟红色名录已经将北极熊确定为渐危物种之一，将全球气候变化定义为影响北极熊栖息地改变的“潜在杀手”。
However, substantial amounts of urban garbage are dumped and buried at the surface, which constitutes a serious pollution threat to the groundwater source.
但其地表堆埋了大量的城市垃圾，对地下水源构成严重的污染威胁。
The meaning and extension of security, the source of security threat, and the object of security as well as the means of defending security all require substantial theoretical modifications.
安全的内涵和外延、安全威胁的来源、安全主体以及维护安全的手段都需要从理论上加以修正。
Land is the substantial basis on which man survives. Therefore the decrease of land productivity is a great threat against man's future.
土地是人类赖以生存的物质基础，土地生产力的降低对人类未来构成极大威胁。
Land is the substantial basis on which man survives. Therefore the decrease of land productivity is a great threat against man's future.
土地是人类赖以生存的物质基础，土地生产力的降低对人类未来构成极大威胁。
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