甲醛是一种常见的有害气体，广泛存在于家居环境中。Formaldehyde is a common harmful gas found widely in home environments.Formaldehyde is a hazardous substance frequently encountered in residential https://janicejphw047974.blogdigy.com/formaldehyde-exceeding-the-standard-health-hazards-should-not-be-underestimated-56356917