英语听力：自然百科 野性俄罗斯之西伯利亚 Siberia—10

 But he soon wises up. The thick neck absorbs the blows .The delicate brain is cushioned beneath the core of hollow horns.

 

He defends his claim and relocates his harem. But one challenger won't give up so easily. They can crash at nearly 100 km/h. Eventually, a final blow signals the end.

 

When spring comes to Siberia, the floodgates open. Over millennia¹, racing² waters have cut swathes through hard rocks and pine forests. In Southeast Siberia, much of it runs to the seventh largest fresh water lake in the world, 636 kilometers long and 80 kilometers at its widest, this is Lake Baikal. This record- breaking lake holds 20% of the earth's fresh water as much as all five of America's great lakes combined. 

 

But with the water temperature rarely rising above eight degrees Celsius³, it is not as inviting⁴ as it looks. But that's ok for the residents--the only fresh water seals in the world, the Baikal seals.

 

No one knows how they got to the enclosed lake. One theory is that they evolved from ringed seals half a million years ago when the Arctic Ocean extended further into Siberia.

1 millennia   

n.一千年，千禧年

参考例句：

• For two millennia, exogamy was a major transgression for Jews. 两千年来，异族通婚一直是犹太人的一大禁忌。
• In the course of millennia, the dinosaurs died out. 在几千年的时间里，恐龙逐渐死绝了。

2 racing   

n.竞赛，赛马；adj.竞赛用的，赛马用的

参考例句：

• I was watching the racing on television last night.昨晚我在电视上看赛马。
• The two racing drivers fenced for a chance to gain the lead.两个赛车手伺机竞相领先。

3 Celsius   

adj.摄氏温度计的，摄氏的

参考例句：

• The temperature tonight will fall to seven degrees Celsius.今晚气温将下降到七摄氏度。
• The maximum temperature in July may be 36 degrees Celsius.七月份最高温度可能达到36摄氏度。

4 inviting   

adj.诱人的，引人注目的

参考例句：

• An inviting smell of coffee wafted into the room.一股诱人的咖啡香味飘进了房间。
• The kitchen smelled warm and inviting and blessedly familiar.这间厨房的味道温暖诱人，使人感到亲切温馨。