Researchers studying fossils in Norway have discovered that the world's seas plummeted 9C from 13C to just 4C around 137million years ago.

　　调查者在研究挪威的恐龙化石时发现，在一亿三千七百万年之前，海水温度从13度急剧降到4度。

　　They believe this was caused by a sudden change in the Atlantic Gulf Stream - a phenomenon many experts fear is about to happen again.

　　科学家们认为造成这一温度骤降的原因是墨西哥暖流造成的，而且专辑们认为这一现象至今仍可能发生。