How People Learned to Fly 在線電子書 圖書標籤:
發表於2024-11-24
How People Learned to Fly 在線電子書 pdf 下載 txt下載 epub 下載 mobi 下載 2024
People have taken dangerous risks trying to fly. Some inventors built wings for their arms and flapped them like birds. Some built balloons. Some built machines that glided with the wind. It wasn't easy, though, and it took a long time and much experimentation until people invented the airplane. Read and find out how people learned to fly.
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How People Learned to Fly 在線電子書 pdf 下載 txt下載 epub 下載 mobi 下載 2024