Breakdown of kono uirusu ha kuukityuu de hirogarimasu.
はha
topic particle
このkono
this ... adnominal
空気kuuki
air
〜中〜tyuu
throughout, duringused after a noun
広がるhirogaru
to spread; to stretchintransitive
でde
method/means particle
ウイルスuirusu
virus
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