【英语时差8,16】罕见的独角鲸-上
时间：2019-01-22 作者：英语课 分类：英语时差8，16
英语课
Narwhals aren’t fish, they’re mammals--a rare type of whale. They have a famous spiraled tusk 1. The tusk, which is commonly misconceived for a horn, is actually an elongated 2 tooth. Only male narwhals grow tusks 3, 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 intimidate 4 rival males.
n.獠牙，长牙，象牙
- 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。
v.延长，加长( elongate的过去式和过去分词 )
- 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》
n.（象等动物的）长牙( tusk的名词复数 )；獠牙；尖形物；尖头
- 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）
vt.恐吓，威胁
- 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。