【英语时差8,16】独角鲸（上）

Narwhals aren’t fish, they’re mammals-a rare type of whale.And a spiraled tusk¹ they famous for isn't a horn.But it is actually an elongated² tooth. Only male narwhals grow tusks³, which can be over six to almost ten feet long–more than half their body length. What Is The Function Of The Tusk? There is patchy evidence for several different hypotheses. Since only males grow tusks, it could have evolved in response to sexual selection. Like the tails of male peacocks, the tusk could be used to attract and impress females and intimidate⁴ rival males. Males may use their tusks in fights with other males to establish social hierarchies⁵. Tusks could also be used for breaking through thin layers of ice in their frigid⁶ ocean habitat.

1 tusk   

n.獠牙，长牙，象牙

参考例句：

• The wild boar had its tusk sunk deeply into a tree and howled desperately.野猪的獠牙陷在了树里，绝望地嗥叫着。
• A huge tusk decorated the wall of his study.他书房的墙上装饰着一支巨大的象牙。

2 elongated   

v.延长，加长( elongate的过去式和过去分词 )

参考例句：

• Modigliani's women have strangely elongated faces. 莫迪里阿尼画中的妇女都长着奇长无比的脸。
• A piece of rubber can be elongated by streching. 一块橡皮可以拉长。 来自《用法词典》

3 tusks   

n.（象等动物的）长牙( tusk的名词复数 )；獠牙；尖形物；尖头

参考例句：

• The elephants are poached for their tusks. 为获取象牙而偷猎大象。
• Elephant tusks, monkey tails and salt were used in some parts of Africa. 非洲的一些地区则使用象牙、猴尾和盐。 来自英语晨读30分（高一）

4 intimidate   

vt.恐吓，威胁

参考例句：

• You think you can intimidate people into doing what you want?你以为你可以威胁别人做任何事？
• The first strike capacity is intended mainly to intimidate adversary.第一次攻击的武力主要是用来吓阻敌方的。

5 hierarchies   

等级制度( hierarchy的名词复数 )； 统治集团； 领导层； 层次体系

参考例句：

• That's a trip of two hierarchies. 那是两个领导层之间的互访。
• Hierarchies of authority, spans of control, long-range plans, and budgets. 等级森严的权力机构，控制范围，长期计划，预算。 来自英汉文学 - 廊桥遗梦

6 frigid   

adj.寒冷的，凛冽的；冷淡的；拘禁的

参考例句：

• The water was too frigid to allow him to remain submerged for long.水冰冷彻骨，他在下面呆不了太长时间。
• She returned his smile with a frigid glance.对他的微笑她报以冷冷的一瞥。