Baleful
发表于 2025-3-21 17:03:54
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一瞥
发表于 2025-3-21 20:32:37
What Needs Inventing?, not economic, the materials were not available or they simply wouldn’t work—like steam operated helicopters which were no more practical than Leonardo da Vinci’s human power helicopter designed five hundred years earlier.
真实的人
发表于 2025-3-22 04:20:58
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Adjourn
发表于 2025-3-22 05:38:01
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Customary
发表于 2025-3-22 11:16:24
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多产鱼
发表于 2025-3-22 16:12:35
Teaching Invention,There are three good reasons why every young person should have their eyes opened to the methods and joys of inventing.
欢笑
发表于 2025-3-22 18:22:53
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Bravura
发表于 2025-3-23 00:12:10
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不知疲倦
发表于 2025-3-23 01:54:59
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indignant
发表于 2025-3-23 07:30:42
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