Short parabolic profile. Four blades design.

短抛物线外型，四刀翼设计。

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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。

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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。

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Charlene Stewart, 55, of Texarkana, passed up to four hacksaw blades to her son, authorities said.

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As it gained speed, it rose up out of the water on four sets of blades, like the slats found on venetian blinds.

FORBES: Eden at a Discount

During take-off, the four 15-metre rotor-blades will be folded flat against the craft's body.

ECONOMIST: On a rotor-blade and a prayer | The