| 摘要 |
An impeller blade includes an elongate impeller blade body having opposing proximal and distal ends, opposing first and second edges extending from the proximal end to the distal end, and opposing upper and lower sides. The lower side includes a major generally concave channel extending from an open end thereof at the distal end of the impeller blade body to a closed end thereof adjacent to the proximal end of the impeller blade body.
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