These levels of indoor air pollutants may be of particular concern because most people spend about 90% of their time indoors.
由于多数人大约90%的时间都在室内度过，室内空气污染的这种程度应当引起人们的特别关注。
These levels of indoor air pollutants may be of particular concern because most people spend about 90% of their time indoors.
由于多数人大约90%的时间都在室内度过，室内空气污染的这种程度应当引起人们的特别关注。
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