blades
n.
刀口( blade的名词复数 );
（机器上旋转的）叶片;
桨叶;
（船桨的）桨叶;
例句:
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Overhead, the chopper roared and the big blades churned the air.
头顶上，直升机在呼啸，巨大的螺旋桨叶片搅动着空气。
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He complained a little of a nagging pain between his shoulder blades.
他有几句提到说肩胛骨之间一直在疼。
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Blades of grass and majestic oaks had common ground.
来自THETIMES
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The IPC said all blades adhered to strict regulations.
来自BBC
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They have been turning out great blades for 400 years.
他们生产优质刀片已经有400年历史了。
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Having fixed blades also should reduce complexity and weight.
来自SA