एक विशाल मशीन पूरे भारत को कैसे बदल रही है#Science #hindi #india #mumbai

Tunnel Boring Machine यानी TBM एक विशाल मशीन होती है, जो जमीन के अंदर पहाड़ों और मिट्टी को काटकर सुरंग (tunnel) बनाती है।

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