This is the 2463rd most frequent Arabic word.
مبينا
Clear or obvious.
Here, 'مبينا' is the present participle describing the teacher's act of explaining while writing on the board.
كتب المعلم الدرس على اللوحة مبينا الأفكار الرئيسية.
The teacher wrote the lesson on the board, explaining the main ideas.
'مبينا' functions as a present participle here, portraying the action of elucidating linked to the lecturer.
يتحدث المحاضر بثقة مبينا مفاهيم معقدة بوضوح.
The lecturer speaks confidently, elucidating complex concepts clearly.
In this sentence, 'مبينا' is used as the active participle denoting explanation or clarification, modifying the subject 'the student'.