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.
發表於2024-09-06
How People Learned to Fly 2024 pdf epub mobi 電子書 下載
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How People Learned to Fly 2024 pdf epub mobi 電子書 下載