一艘四桨的小艇，在四下游弋。

A four-oared galley is hovering about .

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上龙用四根桨状的四肢推动它庞大的身体在水里游来游去，轻而易举地就能掠食形似海豚的鱼龙。

Using four paddle-like limbs to propel its bulky body through the water, the pliosaur made easy work of passing prey such as dolphin-like ichthyosaurs.

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“和海龟类似，它的四肢是桨状的，但仍然具有可以移动的指头，”艾森博格教授说道。

"Similar to marine turtles, its limbs are paddle-shaped, but still possess movable digits," said Prof Eisemberg.

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