科学喝水要知道的4件事

 【英文原文】

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 automobile¹ which needs a certain amount of gas. There are conditions under which a person could die of dehydration² 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.

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 exhaling³. Ever notice the fog you can make on a window by breathing on it? That’s water vapor⁴ leaving your body.

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.

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.

 

1 automobile   

n.汽车，机动车

参考例句：

• He is repairing the brake lever of an automobile.他正在修理汽车的刹车杆。
• The automobile slowed down to go around the curves in the road.汽车在路上转弯时放慢了速度。

2 dehydration   

n.脱水，干燥

参考例句：

• He died from severe dehydration.他死于严重脱水。
• The eyes are often retracted from dehydration.眼睛常因脱水而凹陷。

3 exhaling   

v.呼出，发散出( exhale的现在分词 )；吐出（肺中的空气、烟等），呼气

参考例句：

• Take a deep breath inhaling slowly and exhaling slowly. 深呼吸，慢慢吸进，慢慢呼出。 来自互联网
• Unclasp your hands and return to the original position while exhaling. 呼气并松开双手恢复到原位。 来自互联网

4 vapor   

n.蒸汽，雾气

参考例句：

• The cold wind condenses vapor into rain.冷风使水蒸气凝结成雨。
• This new machine sometimes transpires a lot of hot vapor.这部机器有时排出大量的热气。