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.
相对于食叶蔬菜(如生菜)往往生长得更快。这些食根蔬菜和十字花科蔬菜是冬季最佳的选择。
Compared with leafy vegetables (like lettuce) that tend to grow much more quickly, these root vegetables and crucifers make excellent winter choices.
斯坦福大学霍普金斯海洋站的萨尔瓦多·乔根森博士发现，冬天，食人鲨会离开海豹聚居地(整个夏天它们都在那里以海豹为食)，动身前往温暖的水域。
Dr Salvador Jorgensen, of Stanford University's Hopkins Marine station, found that in winter, sharks leave seal colonies, where they feed all summer, and set off for warmer waters.
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