That's because a regular supply of water means a regular supply of prey, including voles and ground squirrels.

这是因为有着充足的水源遍意味着有着充足的猎物，这些猎物包括田鼠和地鼠。

By raising herds of animal such as sheep, humans had a regular supply of meat and clothing.

通过饲养羊群等动物，人类有规律地供应肉类和衣物。

Itaipu was built to provide Paraguay and Brazil with a regular supply of water for their agriculture and industry.

建造伊代普水坝是为了定期给巴拉圭和巴西提供农业与工业用水。

Despite being so poor, she bought him his first camera at nine years old, and bought him regular art supplies.

尽管家境贫寒，她还是在他九岁的时候给他买了第一台相机，并定期给他买美术用品。

Mum or dad, of course, provides a regular supply of pocket money, but uncles and aunts are always a source of extra income.

爸爸妈妈当然经常会给孩子零花钱，但是，叔舅婶姨也是孩子们额外收入的来源。

Previously, if astronauts need the tool, they could have waited a month for it to be flown up on the regular supply flights.

之前，如果宇航员需要这种工具，他们就必须等上一个月，等着工具通过常规的供给飞行来送到。

It says that the observers were stopped on a regular supply mission near a post that had recently been abandoned because of heavy fighting in the area.

称这些观察员是在一个哨卡履行常规供给任务时被阻拦的，此地最近因激烈的战斗被抛弃不管。

He decided that he would abjure all Milesian and Arabian methods of entertainment, and subscribe to Mudie's for a regular supply of mild and innocuous romance.

他决定放弃所有米利都和阿拉伯的娱乐方式，并订阅穆迪的定期供应的温和无害的浪漫。

What it meant was we learned how to sow crops and harvest them and build a civilization that could stay in one place because we had a regular food supply.

这意味着我们学会了如何播种和收割庄稼， 并建立一个可以留在一个地方的文明， 因为我们有定期的食物供应。

Land-slips and floods also give rise to bare virgin ground; and a tree now and then owes its existence to a burrowing wolf or squirrel, but the most regular supply of fresh soil is furnished by the fall of aged trees.

山体滑坡和洪水也造成了裸露的处女地；有时，一棵树的存在要归功于穴居的狼或松鼠，但最有规律的新鲜土壤供应是由老树的倒下提供的。