每日口說挑戰 如果地球沒了水和食物，該怎麼辦呢? (What If Earth Ran Out Of Water And Food?)

今日挑戰句子

The water we have doesn’t exactly do a disappearing act, it just changes states, evaporating into the atmosphere then raining or snowing back down. The problem is, most of that water -- about 77 percent -- is salt water. And the fresh water we need is mostly frozen at the poles.

地球上的水其實沒有消失，只是改變了他的狀態而已：蒸發到大氣中，以下雨或是下雪的形式回到大地。問題是，絕大部分的水——大約 77% ——都是鹹水（也就是海水）。而我們所需的純水大多結凍於兩極處。