经过可心的解释大家恍然大悟。不过时间紧迫大家没有浪费时间,大家用最快的速度穿过了魔法门。穿过魔法门后,大家被眼前的景物惊呆了!空气中弥漫着重重的硫磺的味道,如果用PM2.5标准来衡量的话,这里的空气质量绝对是超重度污染了。(注:PM2.5是指大气中直径小于或等于2.5微米的颗粒物,也称为可入肺颗粒物。)视野中没有一株植物, After a pleasant explanation we suddenly realized. But time is tight we did not waste time, everyone with the fastest speed through the magic door. Through the magic door, we were shocked by the immediate scenery! The air filled with heavy sulfur smell, if measured by the PM2.5 standard, the air quality here is absolutely overweight pollution. (Note: PM2.5 refers to particles in the atmosphere less than or equal to 2.5 microns in diameter, also known as particles that can enter the lungs.) There is not one plant in the field of vision,