If I were to stop drinking water right now, how long could I live? There are several different factors involved here. A human being isn’t an automobile which needs a certain amount of gas. There are conditions under which a person could die of dehydration within a single day, and other conditions whereby a person might live for over a week. It’s unlikely, though, anyone could go much beyond that.

假如我現(xiàn)在開始不喝水，我能活幾天呢？這里涉及到了多方面的因素。汽車只需要一定量的汽油就夠了，而人并不是汽車。有多種條件能使一個在脫水狀態(tài)下的人在一天內(nèi)死亡，而在其他條件下，人就可能活過一星期。但是不大會有人能夠超越這個極限很多。

Water comes into our systems not just from drinking but from eating as well. It goes out of us through urine, through sweat, a even through exhaling. Ever notice the fog you can make on a window by breathing on it? That’s water vapor leaving your body.

不僅通過飲水，水還通過吃飯進(jìn)入我們的身體循環(huán)系統(tǒng)。我們通過小便，出汗，甚至呼氣來排水。以前你有沒有注意到，當(dāng)你對著窗子呼氣的時候，窗子上會形成霧氣？那就是水分從你的身體中蒸發(fā)掉了。

The biggest reason it's bad to lose too much water is that the actual volume of your blood goes down. When blood volume goes down, blood pressure goes down. As blood pressure goes down, body heat goes up, because your blood helps regulate your core body temperature. Without enough blood, you can’t cool off. Pretty soon you overheat.

說失水過多有害的最大原因就是，它能使你身體的血液量減小。當(dāng)血液減少了，血壓就降低。血壓降低身體就會變熱，因為血液可以幫助調(diào)節(jié)體溫。沒有充足的血液，你的體溫就降不下來。很快，身體就過熱了。

So various factors, from eating to circulatory health to the ambient temperature, play a part in how long you could go without water. Probably the biggest factor, though, is simply age: young people are much more likely to overheat faster than adults, which is why it’s especially important to keep an eye on the little ones on hot summer days.

因此，多種因素，從飲食到循環(huán)系統(tǒng)的健康度，再到四周環(huán)境的溫度，都對你在不喝水的狀態(tài)下能活幾天產(chǎn)生影響。但最主要的因素可能只是年齡：年輕人會比成年人更容身體過熱，這也是為何在炎熱的夏天我們要多照看著點兒小朋友的原因。

new words:

dehydration:脫水
water vapor:水蒸氣
urine:小便
exhale:呼氣

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