Dark or Light—It,s Amazing

Dark or Light—It's Amazing We all know what organs are. Things like the heart, lungs and kidneys are all organs. But, do you know what is the biggest organ of all? Here are some hints. It can be very dark or it can be very light. It can be very smooth or very rough. That's right—it's skin! Our skin is an amazing thing. Imagine if scientists could invent something that could heal itself?That's exactly what skin does! Adults have more than 11 miles of blood vessels in their skin! Those blood vessels help to keep skin warm or to cool it down. In fact, on a hot summer day, a person can sweat as much as 3 gallons.

暗还是亮——太神奇了 我们都知道器官是什么。像心脏、肺和肾脏都是器官。但是，你知道最大的器官是什么吗? 这里有一些提示。它可以很暗，也可以很亮。它可以很光滑，也可以很粗糙。 没错，这是皮肤! 我们的皮肤是一个神奇的东西。想象一下，如果科学家能发明一种可以自愈的东西?这正是皮肤的作用! 成年人的皮肤里有超过11英里长的血管!这些血管帮助皮肤保暖或降温。事实上，在炎热的夏天，一个人的出汗量可达3加仑。

The reason why there are different colours of skin is pigment. The more pigment you have in your skin, the darker it is. So, take care of your skin. Remember, you are going to need it for a long time!

皮肤颜色不同的原因是色素。你皮肤里的色素越多，颜色就越深。 所以，照顾好你的皮肤。记住，你会用很长一段时间!