论文部分内容阅读
Q:一个多月前,妈妈买回来一个新的铝锅,开始它银光闪闪的,可是烧了几次开水后,被水浸到的地方全都变成了灰黑色,这是怎么回事呢?
Q: More than a month ago, my mother bought a new aluminum pan and started it glittering, but after it was boiled for a few times, all the water was turned gray-black, what was going on? ?