土地不断受到人口数量增加所带来的压力，这些增加的人口需要土地提供食物和养料。

Expanding populations are subjecting the land to increasing pressures to provide them with food and fuel.

youdao

这座城市一直以来都有大量的外国出生人口（1990年比例为26.5%），进一步增强了人口多样性。哈佛大学和伯克利大学的经济学家认为，这预示着良好的流动性。

The city had a large foreign-born population (26.5 percent in 1990), leading to broader diversity, which, the Harvard and Berkeley economists say, is a good predictor of mobility.

youdao

为了做出更准确的人口预测，人口统计学家必须比现在更多地了解生育率的社会和经济决定因素。

To develop more accurate population forecasts, demographers have to know a great deal more than now about the social and economic determinants of fertility.

youdao

By 1852-53,Boston and New York think about this--Boston-- although we're getting close to that again Boston and New York had 50% foreign-born populations.

在1852年到1853年间,波士顿和纽约,你们听听这个数据,虽然我们现在又快接近这个比例了,那时移民占据波士顿和纽约人口的50%

耶鲁公开课 - 美国内战与重建课程节选

Because nutrition is going to be one of the big problems of your generation; how to have enough nutritious food for the population as it grows.

因为营养,对你们这一代人是个大问题,怎样才能确保食物的质和量,能够满足日益增长人口的需求

耶鲁公开课 - 生物医学工程探索课程节选

You've got people from the outskirts coming in for food and safety; but, the population is slightly over two million people, and that's a lot of mouths to feed.

人们从郊区前往城市寻求食物和庇护,然而人口数量很快突破了二百万,人人都在等米下锅

耶鲁公开课 - 1871年后的法国课程节选