কিভাবে নদীতে বাঁধ তৈরি করা হয় ? জানুন

এই ভিডিওতে আমরা আলোচনা করেছি কিভাবে খরাস্রতা ভয়াবহ নদীতে বাঁধ তৈরি করা হয়।ভিডিওটা সম্পূর্ণ দেখুন এবং জানুন।

In this video with talk about how engineers made dam on river.

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