The correct preposition is "in", as we refer to something happening inside a place.
So, "in the classroom" is the proper phrase.
Dwell on is a phrase.
Dwell on means emphasize on something or highlight something.
Dwell on means کسی بات پر زور دینا
He dwelt on the need of discipline انہوں نے نظم و ظبط کی ضرورت پر زور دیا
Obstreperous ایسا شخص جو شور مچانے والا، ضدی، یا قابو میں نہ آنے والا ہو۔ Unruly "بے قابو" یا "نظم و ضبط سے باہر"۔
You must not shout in class.
آپ کو کلاس میں چیخنا نہیں چاہیے۔
"Shout in class" refers to making noise within the classroom.
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