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"it's a variable-pitch propeller, which is like having gears on a bike, " land says.
“这是一个变距螺旋桨，就像在自行车上安齿轮一样，”兰德说。
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"it's a variable-pitch propeller, which is like having gears on a bike, " land says.
“这是一个变距螺旋桨，就像在自行车上安齿轮一样，”兰德说。
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