现在很多家庭都在喝桶装水。的确，这种桶装水即时尚又方便，而且想喝热的，想喝凉的，还是常温的都是随自己的便。但是饮用桶装水的家庭一般一桶水要多长时间才换呢？
Now many families are drinking bottled water. Indeed, this kind of bottled water is fashionable and convenient, and if you want to drink hot, cold or normal temperature water, it's your choice. But how long does it take for a family to change a bucket of water?
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调查发现，普通百姓在饮用桶装水的过程中存在一个最大问题，是他们认为一桶水喝的时间长了对身体并没有什么危害。实际上据有关研究结果表明，桶装水上机时有一个保质期---这个保质期最多不能超过２０天。
The survey found that the biggest problem of ordinary people in the process of drinking bottled water is that they think that drinking a bucket of water for a long time is not harmful to their health. In fact, according to relevant research results, bottled water machine has a shelf life - this shelf life can not exceed 20 days at most.
绝大部分饮水机的进气孔都没有消毒过滤装置。使一些空气中微生物和灰尘就从进气孔进入到水罐中，从而造成饮水器的污染。所以我们喝桶装水的时间不宜太长。如果超过了２０天还没有喝完的话，剩下的水就不要再喝了。
The air inlet of most water dispensers has no disinfection and filtration device. Some microorganisms and dust in the air enter the water tank from the air inlet, thus causing the pollution of the water dispenser. So we should not drink bottled water for too long. If you haven't finished drinking after more than 20 days, don't drink the rest of the water.