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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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。

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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