书籍 Summit 1B - 第 6 单元 - 第 3 课

the hard or pointed part of a bird's mouth

鸟嘴, 喙

a hard protuberance made of keratin that grows on the heads of some mammals such as cattle, goats, etc.

角, 角质

a group of people, often with shared characteristics, who regularly interact with each other

社会群体, 社区

(of a thing or type of behavior) appropriate for or intended to defend one against damage or harm

保护的, 防护的

related to the body rather than the mind

身体的, 肉体的

an important or distinctive aspect of something

特征, 特点

a group of birds of the same type, flying and feeding together

雀群, 团体

a group of animals, such as cows, sheep, etc. that are from the same species, which move and feed together

兽群, 群体

a large number of fish or sea mammals that swim together

鱼群, 学校（鱼类）

a group of animals of the same type hunting or living together, particularly wolves

群, 包

a sharp and curved nail on the toe of an animal or a bird

爪子, 爪子

the horny and hard part at the end of a limb of a mammal, such as a horse

蹄, 趾