实际上，看起来有些像海豚的鱼龙，和纵然有长颈和菱形状脚桨的蛇颈龙都不与如今存活的物种相似。
Ichthyosaurs, indeed, looked somewhat like dolphins, though plesiosaurs-with their long necks and diamond-shaped paddles-were unlike anything now alive.
桨根本没有划在水面。只见他两脚高高翘起，整个儿跌倒在躺倒的河鼠身上。
He missed the surface altogether, his legs flew up above his head, and he found himself lying on the top of the prostrate rat.
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.
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