Solution de système de sécurité et de surveillance MCCTV Actualités de CCTUNG — Bison

In the wide lands of the American West, there is a very special place. It is called Yellowstone National Park (国家公园). It is the first national park in the world. Under the ground of the park, there is a huge volcano (火山). When you walk into Yellowstone, you will see many colorful hot springs (温泉). The most famous one is the Grand Prismatic Spring (大棱镜温泉). It looks like a giant (巨大的) paint palette (调色盘). The water shows blue, green, yellow, orange, and red colors. These beautiful colors come from tiny (微小的) living things called microorganisms (微生物) that live in the...