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Book 3 · roots 221–230
Science, Health & Environment
Electricity, rays, spheres, instruments, food, health, salt, climate, erosion and cutting — roots for science classes, hospitals and the changing environment of Bangladesh.
বিদ্যুৎ, রশ্মি, পুষ্টি, স্বাস্থ্য, লবণাক্ততা, জলবায়ু ও নদীভাঙন — বিজ্ঞান, স্বাস্থ্য ও পরিবেশের দশটি মূল
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Science, Health & Environment
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