Note
Sometimes the initial t-sound changes into a d-sound due to rendaku, a phenomenon where the initial consonant of the second part of a compound word becomes voiced.
Unfortunately, there are no clear rules for when rendaku applies.
Usages of 〜tyuu
電気 ストーブ で 部屋中 に 熱 が 広がった。denki sutoobu de heyadyuu ni netu ga hirogatta.
Heat was spread throughout the room by the electric stove.
https://tatoeba.org/eng/sentences/show/124854
この ウイルス は 空気中 で 広がります。kono uirusu ha kuukityuu de hirogarimasu.
This virus spreads through the air.
旅行中 に たくさん の 写真 を 撮りました。ryokoutyuu ni takusan no syasin wo torimasita.
I took a lot of photos during the trip.
彼女 は いつも 授業中 に メモして いる。kanozyo ha itumo zyugyoutyuu ni memosite iru.
She always takes notes during class.
散歩中 に 美しい 花々 を 見つけました。sanpotyuu ni utukusii hanabana wo mitukemasita.
I found beautiful flowers while walking.
入院中 は たくさん の 本 を 読みました。nyuuintyuu ha takusan no hon wo yomimasita.
I read a lot of books during my hospitalization.
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