China's panda experts believe the 300 pandas in captivity are the minimum viable population for the species to reproduce and sustain in 100 years to come.
中国的熊猫专家认为大熊猫在人工饲养的300是最小存活种群的物种繁殖和维持100年的到来。
He would like to concentrate his citizens, boosting the population density in areas that are still economically viable, while encouraging people to move out of districts that are not.
他希望将他的市民都聚集起来，而不是鼓励人们离开这个地方，促进地区的人口密度在经济上依旧是可行的。
Boosting the population density in areas that are still economically viable, while encouraging people to move out of districts that are not.
促进经济依旧可行的地区的人口密度，同时鼓励人们从没希望的地段搬迁出来。
"We want to minimize population growth, and the only viable way to do that is through more effective family planning," said Casterline.
他接着说：“要想减少人口增长，唯一可行的方法就是借助更有效的生育控制项目。”
A viable city needs vibrant economic activity and a sizable population to sustain itself.
一座有活力的城市需要活跃的经济活动和足够规模的人口才能维系。
"Because fewer risks are associated with behavioural therapies, they may be a viable treatment alternative in a healthy elderly population with no cognitive impairment," the researchers added.
相比较起来，其它一些不用服药的方法，如认知行为疗法则更适合于老年人用来对抗失眠症。
"Because fewer risks are associated with behavioural therapies, they may be a viable treatment alternative in a healthy elderly population with no cognitive impairment," the researchers added.
相比较起来，其它一些不用服药的方法，如认知行为疗法则更适合于老年人用来对抗失眠症。
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