They talked loudly in the classroom.
Meaning: This means they were communicating verbally in a way that could be easily heard in the classroom.
Choice of Words: Talked means to communicate verbally with someone. Loudly means in a manner that is easily heard. Classroom is a room in a school where students learn. When you put them together, the sentence means that they communicated verbally in a manner that was easily heard in the classroom.
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Related Expressions