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ادامه دادن گفتگوAir Resistance Science Experiment https://blogs.glowscotland.org.uk/er/kirkhill21b/2019/05/09/air-resistance-science-experiment/
Air Resistance Science Experiment https://blogs.glowscotland.org.uk/er/kirkhill21b/2019/05/09/air-resistance-science-experiment/