Short parabolic profile. Four blades design.
短抛物线外型，四刀翼设计。
Axial impellers consist of four blades at a 45o Angle.
轴流叶轮由四个在45度角的叶片组成。
Doctors give her two weeks to live, and then, on top of everything, a tornado comes in and it blows the roof off the house and it impales four blades of grass in her side.
医生说她只能活两个星期了，这时，一股龙卷风刮了进来，它掀掉屋顶，四片草叶子刺到她的身上。
The geometric shape and the height of the four blades, the width of front cutting edges and a relative position between the planes composed of the front of the blades are provided with own features.
四块刀片的几何形状、高度、前切削刃的宽度以及刀片前面所组成的平面之间的相对位置等独具特点。
The drone, which measures 3ft between the tips of its four carbon fibre rotor blades, uses unmanned aerial vehicle (UAV) technology originally designed for military reconnaissance.
这种无人机从顶端至四个碳纤维旋翼叶片长3英尺（约0.91米），采用了最初设计用于军事侦察的无人机技术。
Blades have four cutting edges that are serrated, same as having 3 spare blades.
刀片为四个锯齿状刀刃，与备用的3个刀片相同。
Blades have four cutting edges that are serrated, same as having 3 spare blades.
刀片为四个锯齿状刀刃，与备用的3个刀片相同。
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