皮艇是封闭的，桨的两端都有桨叶，运动员用脚控制舵，控制船的方向。
Kayaks are closed boats, and the paddles have blades at both ends. Competitors use their feet to control a rudder that steers the boat.
采用现场摄影法，比较世界杯赛中男女皮艇运动员的桨频和划桨节奏。
It applied the method of on-the-spot photograph to comparing the stroke frequency and rhythm of the male and female kayakers who took part in the "World Cup".
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