Assertion: carp's scale | /r/HasProperty | flattened by forward movement of water
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Source sentences:
text: The scales are supported by spines, which feel rough when stroked in a backward direction, but when flattened by the forward movement of water, create tiny vortices that reduce hydrodynamic drag, and reduce the turbulence, making swimming both more efficient, and quieter, compared to that of bony fishes.