the teacher writes blackboard various formulas for chemistry high school young arab |
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| navigate by keyword : formula lesson learn knowledge college education class chemistry teacher student study classroom chalkboard board university science equation concept background teach school blackboard chalk chemist professional scientist scientific drawing chemical hand lecture theory smart young studying caucasian research male solution laboratory biology molecule experiment write person arab one muslim |
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| the teacher writes on the blackboard various formulas for chemistry in high school. young Arab teacher. Back to school concept |
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