@PSQ17266 @Kit_Yates_Maths Exactly. If weather isn't suitable, close the windows and use air cleaners.
Suitably configured windows have to be large enough and located to create ventilation throughout the whole room. Hard to know without a study. Even then, still inconsistent depending on breeze.
@PSQ17266 @Kit_Yates_Maths 完全正确。如果天气不合适，请关闭窗户并使用空气净化器。
适当配置的窗户必须足够大，并且位于可以在整个房间内创造通风的位置。不学习很难知道。即便如此，依然依风而行。