Perhaps, for children with asthma, it's what's happening in their home, or perhaps they live close to a freeway with major air pollution that triggers their asthma.
也许，对患有哮喘的孩子们来说， 可能是他们家里有什么问题， 或他们住的离高速公路比较近， 那里空气污染严重， 会引发他们的哮喘。