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Abstract: Speed， strength， stealth and power， the submarine is a mean machine， it takes man into a hostile world. Submarine des...

Country: America Duration: 24 mins Viewers: 236

Abstract: Much of Australia’s land mass was once covered in rainforest. Radical climatic changes caused the rainforest to shrin...

Country: Australia Duration: 20 mins Viewers: 5

Abstract: Every day， mechanical systems make our lives easier. Most of these are made up of simple machines that work together ...

Country: Australia Duration: 20 mins Viewers: 0

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