两边的鳍像翅膀一样伸出来，使他们能够在进入大海之前滑行一段距离。
Fins on its sides stick out like wings, which enables it to glide for some distance before dropping into the sea again.
研究人员使树蛇从15米高的塔顶端飞行，过程中使用了4个摄影机拍摄蛇滑行的轨迹，以拍摄成三维立体图像。
They launched the snakes from the top of a 15-metre tower and used four video cameras to construct 3-D images of the animals’ trajectories.
水上滑行艇一种机动船，设计使船头及船身很大一部分露出水面，船可以高速滑过水平面。
A motorboat designed so that the prow and much of the hull lift out of the water and skim the surface at high speeds.
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