Nick's arm muscles bulged, preparing for the downward stroke.
尼克手臂上的肌肉涨鼓起来，准备着向下一砍。
This upward leader connects with the downward leader and a return stroke occurs. Five more dart leader-return strokes follow.
上行先导与下行先导连接，于是产生了一次回击，随后又是五次以上的直窜先导型回击。
Eventually a negative stepped leader travels downward and reaches the ground, creating a return stroke.
最终一个下行传播的负极梯形先导接触到地面，制造了一次回击。
During the intake or admission stroke, the piston moves downward as a charge of combustible fuel and air is admitted into the cylinder through the open intake valve.
在摄入或中风入院，活塞动作，作为燃料和空气中可燃负责向下是进入气缸通过公开承认，进气阀。
A swimming stroke in which a person swims on one side and thrusts the arms forward and downward alternately while performing a scissors kick.
一种游泳姿势，游泳者侧身向前游，胳膊交替向前、向下划水，同时进行两腿交叉蹬出。
During, or at the end of the arm pull-down of the first stroke after the start and after each turn, a single downward butterfly kick is allowed, but not required, followed by a breaststroke kick.
出发后或每一次转身之后，在第一次大划手之当时或之后，一次向下蝶式踢腿是被允许的(非必要的)然后拌随一次蛙式踢腿。
During, or at the end of the arm pull-down of the first stroke after the start and after each turn, a single downward butterfly kick is allowed, but not required, followed by a breaststroke kick.
出发后或每一次转身之后，在第一次大划手之当时或之后，一次向下蝶式踢腿是被允许的(非必要的)然后拌随一次蛙式踢腿。
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