请你在冬天的某一期间做一个简单易行的实验。在太阳光线照射的雪地上放一块亮色和黑色的尺寸相同的两块布头。过一个小时或两个小时，你将看到黑色布头已经完全沉入到雪里，而亮色的布头仍处在原来的位置上。要究其这样不同的原因也很简单。那就是因为黑色的布头吸收了照到这 Please do a simple experiment for some time in winter. Put a bright piece of cloth and a black piece of cloth of the same size on the snow exposed to the sun’s rays. After an hour or two, you will see the black cloth head has completely sunk into the snow, while the bright cloth head is still in its original position. The reason for this difference is simple. That is because the black head absorbs this