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1·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。

2·According to the controlling requirement of megawatt wind driven generator with variable propeller pitch of horizon axis, the hydraulic control system of a variable propeller pitch is designed.

针对兆瓦级水平轴变桨距风力发电机的控制要求，设计了变桨距液压控制系统。