But in the dry season when ponds and rivers dry up and food becomes more scarce, piranha turn to meat-eating, usually in the form of other fish.

遇上旱季河流和湖泊干涸时，食物变得匮乏，食人鱼就开始吃肉，基本上是吃其他鱼类。

youdao

Rupert Murdoch, the Beaverbrook of our age, once described them as the industry's rivers of gold-but, as he said last year, "Sometimes rivers dry up."

鲁珀特，默多克——我们这个时代的比弗布鲁克一曾把分类广告形容成报业的金河，但是，正如去年他所说的，“有时河流会干涸”。

youdao

A drought in Kenya has become so bad that the country's famed elephants are dying, as rivers dry up and grasslands shrivel in parched game reserves.

在肯尼亚，一场无情肆虐的干旱，带走了肯尼亚享负盛名的大象那一个个无辜的生命、吸干了汩汩流淌的河水、炙烤着各个禁猎区，使得大片大片的草原枯萎消亡。

youdao

Rivers are drying up, grazing land for cattle is scarce, and the dry soil is hard to farm.

VOA: standard.2010.04.01

Silted-up rivers must be expensively dredged before the dry season ends in May, or they will flood again with the first rains.

ECONOMIST: Honduras and Nicaragua

In theory, that will cause rivers fed by Himalayan glaciers to flood first, then will dry up once the glaciers retreat, endangering tens of millions of people in lowland Bangladesh.

FORBES: The New Military War Against Climate Change