【英语时差8,16】罕见的独角鲸-下
时间：2019-02-15 作者：英语课 分类：英语时差8，16
英语课
Males may use their tusks 2 in fights with other males to establish social hierarchies 3. Tusks could also be used for breaking through thin layers of ice in their freezed ocean habitate.
Researchers from Harvard School of Dental Medicine think the giant tooth might also act as a sensory 4 organ. With the electron microscope, they discoveried that the surfaces of narwhal's tusk 1 is covered with millions of tiny nerventings. These nerves connected to the narwhal's brain through a network of tiny tubes in the tooth.
The scientists believed that the narwhals used the sensitive tusks to detect changes in temperature, solt content, and flow patterns in the environment around them. But since only males grow tusks, it's likely that the tusks did not evolve primarily as a sensory organ, more researchers need to really understand why narwhals have tusks, and how they use them.
Researchers from Harvard School of Dental Medicine think the giant tooth might also act as a sensory 4 organ. With the electron microscope, they discoveried that the surfaces of narwhal's tusk 1 is covered with millions of tiny nerventings. These nerves connected to the narwhal's brain through a network of tiny tubes in the tooth.
The scientists believed that the narwhals used the sensitive tusks to detect changes in temperature, solt content, and flow patterns in the environment around them. But since only males grow tusks, it's likely that the tusks did not evolve primarily as a sensory organ, more researchers need to really understand why narwhals have tusks, and how they use them.
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。
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）
等级制度( hierarchy的名词复数 )； 统治集团； 领导层； 层次体系
- 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