国产重口老太和小伙乱,国产精品久久久久影院嫩草,国产精品爽爽v在线观看无码 ,国产精品无码免费专区午夜,国产午夜福利100集发布

文字稿:

This contraption may not look very impressive…

But when the bicycle-powered helicopter defied gravity, it caused great excitement.

Its flight only lasted 64 seconds and reached an altitude of 3.3 metres. Though it was a great achievement for the Canadian team, which spent 18 months designing the chopper.

They won a prize worth $250,000 from the American Helicopter Society.

The team hope to inspire the next generation of aviation pioneers.

Vocabulary 詞匯:

contraption 奇怪的裝置

defied gravity 飛起來

altitude 高度

chopper 直升機(jī)（非正式用語）

pioneers 先鋒，創(chuàng)始人