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.
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。
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The fossil skull of a 50-foot-long (15-meter-long) pliosaur was found in Norway in 2008.
这具颅骨化石来自于一条长达50英尺（合15米）的上龙，它在2008年发现于挪威。
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The researchers plan to excavate the second pliosaur when they return to Spitsbergen this summer.