结论在实验动物屏障系统的新建或改建时，必须按照实验动物设施环境的国家标准。
Conclusion The National Standards for Environment and Facility should be followed when laboratory animal barrier system facilities were built or refitted.
科学家称随着全球气候变化继续影响极地区域的野生动物，这一屏障可能很快就会消失。
Scientists say that barrier may soon fall, as global climate change continues to impact wildlife at the polar regions.
卡萨·德沃尔博士推测，较高的体温对真菌感染的天然屏障，可能是哺乳动物们在恐龙灭绝之后一直繁衍到今天的关键原因。
Such protection against fungal infection, Dr. Casadevall has speculated, could have been crucial for the triumph of mammals following the age of dinosaurs.
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