题目内容

Astronaut Yang Liwei realized a dream that had probably originated long before.()

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Wan Hu’s crazy dream has in it the principles of rocket-powered spaceship.()

During World War II, troops and materials were effectively transported by the Spruce Goose.()

The Spruce Goose was the biggest airplane ever built and flew only once.()

Leonardo da Vinci applied the principles of the birds’ flight to the design of his flying machines.()

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