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://cyrusbmzo176995.blognody.com/41051397/formaldehyde-levels-exceeding-standards-health-risks-cannot-be-ignored