Every large city has its shifting population of vagrants.
每一个大城市都有其人口转移的流浪汉。
Rising population combined with improved nutrition standards and shifting dietary preferences will exert pressure for increases in global food supply.
人口增长、营养标准提高和饮食偏好转变将对全球粮食供应施加压力。
But, Ludwig points out, "on a population basis, [increased birth weight] is shifting risk upward."
但Ludwig指出，“从人口上来说，[出生体重增加]使风险上升了。”
It is the main influence behind the decline of population growth and, perhaps even more important, is shifting the balance of age groups within a population.
它也是人口增长减慢背后的主要推动力。也许更重要的是，它正在改变世界人口中的年龄群体间的相互平衡。
For instance, in a short-timescale prediction such as the sort of films people will like next year, it would be useless to look at the shifting mood of the population over decades.
例如，在短时间内预测下一年人们喜爱的电影类型，如果只查看前几十年观众情绪的变幻将会是毫无意义的。
Population dynamics studies under shifting environmental conditions over a longer time scale can help to determine how different species react to new biotic and abiotic conditions.
在长时间尺度上研究环境变化条件下的种群动态，有助于确定不同物种如何对新的生物和非生物条件做出反应。
Population dynamics studies under shifting environmental conditions over a longer time scale can help to determine how different species react to new biotic and abiotic conditions.
在长时间尺度上研究环境变化条件下的种群动态，有助于确定不同物种如何对新的生物和非生物条件做出反应。
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