To start with, it forced the population to abandon the nomad's life and became sedentary, to develop methods of storage and, often, systems of irrigation.

首先，它会迫使人们放弃游牧生活定居下来，因而使人们开发存储的方法，往往也会开发灌溉系统。

youdao

Again, in the absence of well-functioning health systems, we are unlikely to get even the most basic population data on morbidity and mortality.

同样，如果缺乏运转良好的卫生系统，我们甚至不可能获取关于发病率和死亡率的最基本的人口数据。

youdao

As possible fields of application, Pollack named environmental systems, weather patterns, population genetics, cosmology and oceanography.

波拉克列举了可能应用的领域，如环境系统、气候模式、群体遗传学、宇宙学和海洋学。

youdao

Diabetics who are infected with TB become ill with the disease at three times the ratio of the general population because their immune systems are compromised, said Dr. Seaworth, who is also a professor of medicine at the University of Texas Health Science Center-Tyler.

WSJ: TB's Global Resurgence Amplifies U.S. Risk

However, Carnegie notes that the fiscal budgets of many oil-exporting countries were rising prior to the citizen revolution due to a lack of non-oil revenues, rapid population growth and generous welfare systems.

FORBES: Oil Producers Keen To Defend Crude Price

Ill-designed pension systems magnify the effect of population ageing by creating incentives for people to retire ever earlier.

ECONOMIST: Time to grow up | The