So why did this one isolated population survive when all other yellow-spotted bell frogs have disappeared?
为什么当其他黄斑响铃树蛙消失时唯有这群树蛙生存了下来？
When cigarettes first appeared, they spread the way an infectious disease spreads through a previously isolated population.
香烟刚出现时，就象传染病一样，在各个人群中传播。
The study looked at breeding behaviour in an isolated population of song sparrows living in grasslands on the island of Mandarte, off the coast of Canada.
这一注视繁殖行为的研究在一个隔离的唱歌麻雀群中进行,这一麻雀群生活在远离加拿大海岸的蒙大特岛的草原上.
Random fluctuations in the frequency of the appearance of a gene in a small, isolated population, presumably owing to chance rather than natural selection.
在一个小的、与世隔绝的种族里，基因面貌频率上的偶然波动，可能因为偶然性而不是自然选择。
The team theorised that if the circulation of antibiotic-resistance genes was a natural phenomenon, they would find these genes even in this isolated population.
研究小组的假说推论，如果抗药基因的循环是自然现象的话，那就能在此杳无人迹的地方找到这类基因。
Rather than compare the rate of depression and migraine of the relatives to those of the general population, the study compared rates within this isolated population itself.
这项研究没有将这些亲戚的抑郁症和偏头痛发病率与普通人群相比较，而是在这个隔离的人群内进行比较。
Consort has a population of 714 and is about as rural and isolated as you can get.
康索特有居民714人，地处农村，极其偏远。
First, in order to be truly organic, the beehives must be placed in isolated areas miles from the dense population, industry, traffic congestion, farm fields, treated with chemicals and landfills.
首先，为了得到真正的有机蜜，蜂箱必须放置在隔离人口密集，工业区，交通闭塞，农田，化学处理厂及垃圾填埋场处。
New research suggests that Australia's population wasn't completely isolated from the rest of the world for thousands of years as previously thought.
新的研究表明，几千年来，澳大利亚人并未如之前人们所认为的那样，完全与世界其他地区完全隔绝。
Rupr. in Heilongjiang Province were isolated and purified to analyze the population structure of soft rot bacteria by morphologic characteristics.
生产田采集的软腐病菌进行分离、纯化，并根据形态学特征分析了大白菜软腐病菌的种群组成。
Most clinical features overlap with those of common diseases found in the general population, and some patients have an atypical clinical presentation with only isolated symptoms.
这种疾病的临床特征与很多常见病重叠，某些患者具有不典型临床表现并仅仅合并孤立症状。
A small population is more vulnerable than a larger one, because an episode of severe weather or disease can wipe out a geographically isolated group.
而且小族群又比大族群来得脆弱，因为极端的天候或疾病一旦发生，地理上孤立的小族群就可能整个灭绝。
A small population is more vulnerable than a larger one, because an episode of severe weather or disease can wipe out a geographically isolated group.
而且小族群又比大族群来得脆弱，因为极端的天候或疾病一旦发生，地理上孤立的小族群就可能整个灭绝。
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