“一个秤钩两个蛋,跑进叶子里,果实能做饭。一个秤钩两个蛋,放在燃物上,作用像棉毯。”这是一条谜语,稍加猜想,你定会知道谜底就是二氧化碳(CO2)。二氧化碳无处不在:如果你有兴趣,不妨作个探究。二氧化碳存在于我们的周围,比如身体中、水中、饮料中、空气中……方法也简单,只要 “A scale hooks two eggs and runs into the leaves. The fruit can cook. A scale hooks two eggs and puts them on the fuel. It acts like a cotton blanket.” This is a riddle, guess a bit, you will know The answer is carbon dioxide (CO2). Carbon dioxide is everywhere: If you are interested, you may wish to make a study. Carbon dioxide exists in our surroundings, such as in the body, in water, in beverages, in the air... The method is also simple, as long as