单词	downstroke
释义	downstroke /ˈdaʊnstrəʊk / noun A stroke made downwards: he writes the figure seven with a line through the downstroke... When mean fuselage speed during the upstroke was only 18% of that during the downstroke, stroke frequency was constant with no gliding, so that power output was unchanged throughout descent. Therefore if work per stroke stays constant, enhanced drag resulting from greater fuselage speed during the downstroke limits mean stroke speed, and thus the potential for gliding after a stroke. First, it causes the hip turn to lead the downstroke.
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