首先我们来揭晓上一期的答案，看看有哪些同学猜对了。First of all, let's reveal the answer from the previous issue and see which students guessed right.你知道“人是水做的”这句话是有科学根据的。但是你可能不知道，人身体中的水会随着年龄增长而大量流失，从婴儿时期的90%到老年时的50-60%。可以说，人类的老化就是水分流失的过程，所以，补充水分，确实会让你变得“年轻”。
You know that "people are made of water" is scientifically correct. But you may not know that water in people's bodies can be lost in large quantities as they are aging, from 90 percent in infancy to 50-60 percent in old age. It can be said that human aging is the process of water loss, so replenishing water will really make you "young".你可能知道“脑子进水”这句骂人的玩笑话，但你可能不知道，大脑组织中含水比例高达85%，水摄入不足可能会影响大脑的认知能力。所以，“脑子进水”不一定是坏事。You may know the curse joke of "water in the brain", but you may not know that the proportion of water in brain is around 85%. Insufficient water intake may affect the cognitive ability of the brain. So "water in the brain" is not necessarily a bad thing.你知道水是生命之源，因为以目前所知，没有一种生命形式可以脱离水而存在，所以科学家寻找智慧星球要先看有没有水。但你可能不知道，地球上有液态水的地方就可能有生命，即使那水几乎是沸腾的或者含酸性。You know that water is the source of life, because as far as we know, no life form can exist without water, so scientists need to see if there is water before they look for a smart planet. But you may not know that where there is liquid water on earth, there may be life, even if the water is almost boiling or acidic.你知道地球其实可以称为“水球”，因为水是地球表面数量最多的天然物质，它覆盖了地球71%以上的表面。但你可能不知道，地球上有97%的水都是咸的，有2.1%的水至今仍被冻结在了极地冰盖下面，所以地球上只有不到1%的可用淡水。You know, the earth can actually be called "water ball" because water is the most abundant natural material on the earth's surface, covering more than 71% of the earth's surface. But you may not know that 97% of the water on earth is salty, and 2.1% of the water is still frozen under the polar ice sheet, so there is less than 1% of the available fresh water on earth.当今世界，每3人中就有1人无法获得安全饮水。请珍惜生命之源。In today's world, one in three people has no access to safe drinking water. Please cherish the source of life.
